Normally a number of different errors would signal a hardware problem.
I'm not convinced that you've experienced enough differing errors to suppose that this is a hardware problem.
The Asus P5 series of boards have been known to have issues with memory timings/settings/voltages that have caused BSOD's - so I'd visit both the Asus support website and the support website of the manufacturer of your RAM to ensure that you have the correct settings/timings/voltages.
The dump files point to athrx.sys and USBPORT.SYS. I suspect you D-Link DWA-556 wireless networking adapter (which is not certified as compatible with Windows 7).
There are directions on the D-Link website (in the FAQ's) on how to install this adapter in Windows 7 - so I would suggest following them.
D-Link Xtreme N PCI Express Desktop Adapter
Summary of the BSOD's:
Code:
Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Thu Mar 4 00:55:55.779 2010 (GMT-5)
System Uptime: 0 days 0:14:29.350
BugCheck D1, {8b0040, 2, 0, fffff88004595e00}
*** WARNING: Unable to verify timestamp for athrx.sys
*** ERROR: Module load completed but symbols could not be loaded for athrx.sys
Probably caused by : athrx.sys ( athrx+10ae00 )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: System
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Thu Mar 4 15:04:28.020 2010 (GMT-5)
System Uptime: 0 days 0:55:53.924
BugCheck 50, {fffff800022df7b0, 8, fffff800022df7b0, 0}
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+42907 )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: Steam.exe
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Sat Mar 6 23:07:13.869 2010 (GMT-5)
System Uptime: 0 days 0:54:13.648
BugCheck D1, {0, 2, 0, fffff88003b4a480}
Probably caused by : USBPORT.SYS ( USBPORT!USBPORT_ProcessNeoStateChangeList+18 )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: System
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Sun Mar 7 01:00:45.337 2010 (GMT-5)
System Uptime: 0 days 1:52:30.241
BugCheck BE, {fffff880045b8710, 8000000177d4e121, fffff80003be0400, a}
*** WARNING: Unable to verify timestamp for athrx.sys
*** ERROR: Module load completed but symbols could not be loaded for athrx.sys
Probably caused by : athrx.sys ( athrx+1010 )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: left4dead2.exe