Wierd sound then black screen and frozen.

Is this still occurring regardless of what browser you use?

You have no Windows Updates installed. Please visit Windows Updates and get ALL available updates for your system. Then update the drivers on your system, then visit Windows Update and check the Important Updates - select and install Service Pack 1.

The PERFMON report says that your Microsoft Away Mode System, is disabled. (ACPI\AWY0001\2-DABA3FF-1)
Here's a link to a Google search about it: Microsoft Away Mode System - Google Search
In short, I've seen problems with this being disabled in XP, but don't have any experience with it in Vista/Win7. I'd suggest getting all Windows Updates and updating your motherboard/chipset drivers/utilities from the Asus website. I suspect that getting the Windows Updates will fix this issue.

I suspect the Windows Updates will fix this error (which occurs repeatedly in your Event Viewer System logs):

Event[275]:
Log Name: System
Source: Service Control Manager
Date: 2011-03-28T21:40:24.453
Event ID: 7026
Task: N/A
Level: Error
Opcode: N/A
Keyword: Classic
User: N/A
User Name: N/A
Computer: Home-PC
Description:
The following boot-start or system-start driver(s) failed to load:
amacpi

More to follow.....

As both Maguscreed and zigzag3143 have already stated, the most likely cause for this is your Audio drivers. If updating them doesn't fix it then we have to decide if this is a hardware, compatibility, 3rd party, or Windows issue. There are several ways to do this, the easiest being to run Driver Verifier for a while (gathering data for 3 or 4 crashes).

We can also run these free stress tests to rule out some of your other hardware:

FurMark download site: FurMark: VGA Stress Test, Graphics Card and GPU Stability Test, Burn-in Test, OpenGL Benchmark and GPU Temperature | oZone3D.Net
FurMark Setup:
- If you have more than one GPU, select Multi-GPU during setup
- In the Run mode box, select "Stability Test" and "Log GPU Temperature"
Click "Go" to start the test
- Run the test until the GPU temperature maxes out - or until you start having problems (whichever comes first).
NOTE: Set the alarm to go off at 90ºC. Then watch the system from that point on. If the system doesn't display a temperature, watch it constantly and turn it off at the first sign of video problems. DO NOT leave it it unmonitored, it can DAMAGE your video card!!!
- Click "Quit" to exit

Prime95 download site: Free Software - GIMPS
Prime95 Setup:
- extract the contents of the zip file to a location of your choice
- double click on the executable file
- select "Just stress testing"
- select the "Blend" test. If you've already run MemTest overnight please run the "Small FFTs" test instead. (run all 3 if you find a problem and note how long it takes to error out with each)
- "Number of torture test threads to run" should equal the number of CPU's times 2 (if you're using hyperthreading).
The easiest way to figure this out is to go to Task Manager...Performance tab - and see the number of boxes under CPU Usage History
Then run the test for 6 to 24 hours - or until you get errors (whichever comes first).
This won't necessarily crash the system - but check the output in the test window for errors.
The Test selection box and the stress.txt file describes what components that the program stresses.
More details on the use of this test: Torture test your CPU with Prime95

Two other video stress tests (may be more stressful than FurMark):
Video Memory stress Test - МИРNVIDIA / Утилиты / VMT
Artifact Locator - МИРNVIDIA / Утилиты / Artifact Locator
Sorry, but I don't read the language that this website is made in.

Another interesting test that just came to my attention: Download - OCCT Website english
USE AT YOUR OWN RISK - program doesn't have a whole bunch of safety features to protect you from yourself!

Finally, to clarify about the sequencing of updates - Service Pack installations that fail are usually caused by either malware or older drivers.

First, I suggest that you run several independent scans to ensure that your system is clean. Here's a list of some free one's: Free Online AntiMalware Scanners (read the details at the link)

Next, get ALL available Windows Updates from the Windows Update site. Don't attempt to install Service Pack 1 at this time.

Then, visit the HP website and update ALL of your drivers. Update the drivers for any add-on cards/USB devices that you may be using (from the device manufacturer's website). If the HP website doesn't have drivers for the devices - then visit the support website of the actual manufacturer of the device to get the latest Win7 drivers.

Then, visit Windows Update and select the Important Updates in order to get and install Service Pack 1. IME this usually takes more than an hour to install - so don't let the computer sleep/hibernate while it's doing this.

Then see if you can generate the problem again. Let us know what happens.
Good luck!

Finally, if all that doesn't work, we'll also have to look at your video drivers/hardware - as the rest of the memory dumps all seem to point to them.

The Furmark test listed above will help with that - but also check the advice at this link for other suggestions: STOP 0x116: VIDEO_TDR_ERROR troubleshooting
The ultimate test here is trying another video card - but DON'T buy one (at this point) unless you can return it for a full refund.

Check the HP website for BIOS updates, but DON'T install them yet (I'm unable to locate any BIOS updates for this system). The dumps indicate that your BIOS dates from 2006 (v 3.04) - so I'd have to wonder if there's updates available that may help with your issues.

OLDER DRIVERS PRESENT IN THE DUMP FILES
- Please update these drivers from the device manufacturer's website - or uninstall/remove them from your system. Reference links are included below.
- DO NOT use Windows Update or the Update Drivers function of Device Manager.
- Please feel free to post back about any drivers that you are having difficulty locating.
- Windows Update exceptions may be noted below for Windows drivers:

Code:

amdxata.sys  Tue May 19 13:57:35 2009 (4A12F30F)
cxkhawk3.sys Fri Oct 27 19:35:37 2006 (454297C9)
hcwPP2.sys   Tue Feb 06 13:27:02 2007 (45C8C876)
nvlddmkm.sys Fri Jul 09 17:15:14 2010 (4C379162)
nvBridge.kmd Fri Jul 09 17:10:11 2010 (4C379033)
e1e6232.sys  Fri Jun 05 15:07:54 2009 (4A296D0A)
athr.sys     Thu Oct 08 22:37:40 2009 (4ACEA1F4)
RTKVHDA.sys  Tue Aug 04 05:48:13 2009 (4A7803DD)
usbcir.sys   Mon Jul 13 19:51:18 2009 (4A5BC876)
btusbflt.sys Thu Apr 08 21:11:21 2010 (4BBE7EB9)

http://www.carrona.org/dvrref.html#amdxata.sys
http://www.carrona.org/dvrref.html#cxkhawk3.sys
http://www.carrona.org/dvrref.html#hcwPP2.sys
http://www.carrona.org/dvrref.html#nvlddmkm.sys
http://www.carrona.org/dvrref.html#nvBridge.kmd
http://www.carrona.org/dvrref.html#e1e6232.sys
http://www.carrona.org/dvrref.html#athr.sys
http://www.carrona.org/dvrref.html#RTKVHDA.sys
http://www.carrona.org/dvrref.html#usbcir.sys
http://www.carrona.org/dvrref.html#btusbflt.sys

BSOD BUGCHECK SUMMARY

Code:

Built by: 7600.16385.x86fre.win7_rtm.090713-1255
Debug session time: Wed Mar 23 23:50:27.390 2011 (UTC - 4:00)
System Uptime: 0 days 0:00:11.296
Probably caused by : HDAudBus.sys ( HDAudBus!WdfDeviceAssignSxWakeSettings+1a )
DEFAULT_BUCKET_ID:  VERIFIER_ENABLED_VISTA_MINIDUMP
PROCESS_NAME:  System
BUGCHECK_STR:  0x7E
FAILURE_BUCKET_ID:  0x7E_VRF_NULL_IP_HDAudBus!WdfDeviceAssignSxWakeSettings+1a
Bugcheck code 1000007E
Arguments c0000005 00000000 8772e41c 8772e000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16385.x86fre.win7_rtm.090713-1255
Debug session time: Fri Mar 18 22:49:22.355 2011 (UTC - 4:00)
System Uptime: 0 days 0:08:53.246
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+fc352 )
PROCESS_NAME:  System
BUGCHECK_STR:  0x7E
DEFAULT_BUCKET_ID:  NULL_CLASS_PTR_DEREFERENCE
FAILURE_BUCKET_ID:  0x7E_nvlddmkm+fc352
Bugcheck code 1000007E
Arguments c0000005 8ff32352 8c974ad8 8c9746b0
BiosVersion =  3.04
BiosReleaseDate = 08/23/2006
CPUID:        "Intel(R) Pentium(R) D CPU 3.00GHz"
MaxSpeed:     3000
CurrentSpeed: 3000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16385.x86fre.win7_rtm.090713-1255
Debug session time: Fri Mar 18 22:39:07.562 2011 (UTC - 4:00)
System Uptime: 0 days 0:03:15.453
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+fc352 )
PROCESS_NAME:  System
BUGCHECK_STR:  0x7E
DEFAULT_BUCKET_ID:  NULL_CLASS_PTR_DEREFERENCE
FAILURE_BUCKET_ID:  0x7E_nvlddmkm+fc352
Bugcheck code 1000007E
Arguments c0000005 8ff06352 95d7fad8 95d7f6b0
BiosVersion =  3.04
BiosReleaseDate = 08/23/2006
CPUID:        "Intel(R) Pentium(R) D CPU 3.00GHz"
MaxSpeed:     3000
CurrentSpeed: 3000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16385.x86fre.win7_rtm.090713-1255
Debug session time: Fri Mar 18 22:34:30.716 2011 (UTC - 4:00)
System Uptime: 0 days 0:11:25.623
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
DEFAULT_BUCKET_ID:  GRAPHICS_DRIVER_TDR_FAULT
BUGCHECK_STR:  0x116
PROCESS_NAME:  System
FAILURE_BUCKET_ID:  0x116_IMAGE_nvlddmkm.sys
Bugcheck code 00000116
Arguments 827cf008 8e2f2326 c00000b5 0000000a
BiosVersion =  3.04
BiosReleaseDate = 08/23/2006
CPUID:        "Intel(R) Pentium(R) D CPU 3.00GHz"
MaxSpeed:     3000
CurrentSpeed: 3000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16385.x86fre.win7_rtm.090713-1255
Debug session time: Fri Mar 18 22:21:43.765 2011 (UTC - 4:00)
System Uptime: 0 days 0:08:49.640
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+fc352 )
PROCESS_NAME:  System
BUGCHECK_STR:  0x7E
DEFAULT_BUCKET_ID:  NULL_CLASS_PTR_DEREFERENCE
FAILURE_BUCKET_ID:  0x7E_nvlddmkm+fc352
Bugcheck code 1000007E
Arguments c0000005 8e32b352 96b51ad8 96b516b0
BiosVersion =  3.04
BiosReleaseDate = 08/23/2006
CPUID:        "Intel(R) Pentium(R) D CPU 3.00GHz"
MaxSpeed:     3000
CurrentSpeed: 3000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16385.x86fre.win7_rtm.090713-1255
Debug session time: Fri Mar 18 22:11:33.000 2011 (UTC - 4:00)
System Uptime: 0 days 0:05:10.890
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+fc352 )
PROCESS_NAME:  System
BUGCHECK_STR:  0x7E
DEFAULT_BUCKET_ID:  NULL_CLASS_PTR_DEREFERENCE
FAILURE_BUCKET_ID:  0x7E_nvlddmkm+fc352
Bugcheck code 1000007E
Arguments c0000005 8e306352 8ef91ad8 8ef916b0
BiosVersion =  3.04
BiosReleaseDate = 08/23/2006
CPUID:        "Intel(R) Pentium(R) D CPU 3.00GHz"
MaxSpeed:     3000
CurrentSpeed: 3000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16385.x86fre.win7_rtm.090713-1255
Debug session time: Fri Mar 18 22:05:01.296 2011 (UTC - 4:00)
System Uptime: 0 days 0:04:40.171
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+fc352 )
PROCESS_NAME:  System
BUGCHECK_STR:  0x7E
DEFAULT_BUCKET_ID:  NULL_CLASS_PTR_DEREFERENCE
FAILURE_BUCKET_ID:  0x7E_nvlddmkm+fc352
Bugcheck code 1000007E
Arguments c0000005 8e324352 96a91ad8 96a916b0
BiosVersion =  3.04
BiosReleaseDate = 08/23/2006
CPUID:        "Intel(R) Pentium(R) D CPU 3.00GHz"
MaxSpeed:     3000
CurrentSpeed: 3000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16385.x86fre.win7_rtm.090713-1255
Debug session time: Fri Mar 18 21:59:01.451 2011 (UTC - 4:00)
System Uptime: 0 days 0:17:14.341
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+fc352 )
PROCESS_NAME:  System
BUGCHECK_STR:  0x7E
DEFAULT_BUCKET_ID:  NULL_CLASS_PTR_DEREFERENCE
FAILURE_BUCKET_ID:  0x7E_nvlddmkm+fc352
Bugcheck code 1000007E
Arguments c0000005 8ff2e352 9ecbfad8 9ecbf6b0
BiosVersion =  3.04
BiosReleaseDate = 08/23/2006
CPUID:        "Intel(R) Pentium(R) D CPU 3.00GHz"
MaxSpeed:     3000
CurrentSpeed: 3000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``