Windows 7 Hangs (no BSD)

Having random hangs in Windows 7 Professional 64-bit.
Sometimes several times a day, sometimes none. Seems to boot fine, and operate effectively for some time. Then it freezes during an operation (doesn't seem to freeze when idle).
Most recently in happened when I right-clicked on a link in Firefox to open it in a new tab.
Time before that, when Nero was completing a DVD burn and switching to the data verification process.
Other occurrences I recall: executing a Photoshop operation (core filter, like Blur, I believe), opening a mail item in Outlook.

On hang, no keyboard, no mouse, no CTRL-ALT-DEL available. Sometimes the desktop freezes in place (though without the taskbar), sometimes it's just the desktop *background* (currently just set to a solid color, no image), and sometimes it's a black screen (monitor reports "No source signal detected"). I don't really ever get a BSoD (least not yet). I've waited for up to 10 minutes for the system to return, with no joy.
Since the Veriton does not have a reset, I have to hold the power button until the system shuts down. Selecting "Start Windows normally" on boot seems to boot regularly.

Specifics:
Windows 7 Professional
64-bit (why doesn't Computer -> Properties give the build number anymore?!?)
Acer Veriton M480G
Intel Core2 Quad CPU, 2.66GHz
4GB RAM
ATI Radeon video card (onboard video disabled in BIOS) w/ dual monitors
Onboard audio
2 physical drives internal @ 3 virtual volumes
1, 2, or 3 external USB drives at any given time (though issue occurs even when no external drives connected)
iPod (USB)
System was rolled out to me a week ago. The OS, I believe, is OEM, with OEM-installed apps/utes (McAfee, Commander) uninstalled.
AVG installed (even though perfmon seems not to detect it?)
Corporate network, DHCP (though IP is reserved), firewall appliance rather than Windows Firewall/Defender

Windows_NT6_BSOD_jcgriff2 dump and perfmon report attached.

Any help to troubleshoot would be greatly appreciated. Problem is so random, I can't trust the system right now. Making it hard to work.

Thank you for the response, usasma, I really appreciate it!

I'll look into the hotfixes. I could've sworn I had my Windows Update set to inform me before installing, but maybe I throttled it back too far.

I'm not seeing McAfee Site Advisor as being installed. Not listed in the Programs & Features control panel. There is no program group in the Start Menu. And I'm not seeing any directories with anything like "Site Advisor" in either Program Files or Program Files (x86). I did remove the bundled McAfee when I first got the machine, but I think it was only the AV, and not the suite.

Monitoring the temps, now. Trying to Google to find some benchmark references for this setup.

As for the other events you cited:
- Nokia PC Suite - now removed. Easy enough.
- Adobe AIR - unfortunately, I'm an AIR developer... so uninstalling isn't really an option. Anything else I might be able to do to curtail the errors with this application?
- Networking - I'm not really understanding the question. Using anything on an external server? Like what?

Thanks again, so much, for your insight usasma.
Thank goodness there's folks out there that understand this stuff!

Thanks again for the help so far, usasma. Unfortunately, I continue to have these same or similar issues.

I installed all the recommended hotfixes last week. And then through yesterday and today I've gone back and installed all of the suggested. WindowsUpdate indicates the system is 100% up-to-date.

I ran the McAfee removal tool (never could find any traces of SiteAdvisor in the file system... maybe it was rebranded as something else?). Removal Tool reported the removal was successful, though, like I said, I can neither confirm or deny.

I've run SpeedFan during the majority of my uptime last week. The only anomaly it reported, that I'm aware of, is my secondary HD was pegged as running hot. I'm not 100% convinced this was an accurate reading, because the hardware itself did not seem all that hot to the touch when I tested that way. But this morning, I went ahead and disconnected that drive to see if that helped. It didn't.
Everything else SF reports as green checks most of the time.

I removed the Nokia suite last week.
After resisting last week, I did finally uninstall AIR this morning.
I also did uninstall the PCI hardware ATI Radeon display card, and reenabled the onboard video in the BIOS.
Still, no difference.

As for the network, the reason I'm confused is I'm not really experiencing any network issues locally that I'm aware of. The system is on a work network, and I do use an Exchange server... but inbound and outbound connections have seemed fairly stable.

The box is OEM directly from Acer. Power Supply is their standard unit, I'm sure. What equipment concerns you? The only things that weren't in the case out of the box are the ATI video card (now removed) and the secondary HD (now disconnected). It doesn't seem like those additions would be anything out of the ordinary, does it? I'll dig a little deeper into the make and wattage of the PSU if you think I need to... but as it stands, the video card and extra HD are out of the mix at the moment anyway, so the box should be running back on manufacturers spec and the PSU shouldn't be an issue, I'm thinking.

I've attached a Windows_NT6_BSOD_jcgriff2 dump and perfmon report from the latest hang, and well as logs from SpeedFan. Any further insight or nudges would be greatly appreciated.

Thanks again!

Thanks again, usasma.

Okay... stupid question... how does one uninstall the drivers for hardware that is no longer listed in the Device Manager?

Using Outlook 2007 (12.0.6504.5000) SP2
MSO (12.0.6425.1000)

Still... so odd that you're finding so many errors so as to concern you. As I said, I've noticed little from a user perspective. Outlook launches fine, closes down fine, and has never crashed on this machine that I can remember. Mail seems to come and go without incident, and I never see Outlook's status change to Disconnected or Offline.

Neither WER2917.tmp.hdmp nor WER3123.tmp.mdmp exist in the C:\Users\carls.HMH\AppData\Local\Temp\ directory (at last check). And the WER\ReportQueue directory is absolutely huge (19MB). Possible to email it directly, rather than posting here?

I realized I never closed the loop on this.
Sorry about that. Especially to usasma for his immense help.

Took the system all the way back to a clean factory config. And it became obvious it was still overheating... straight from the manufacturer.
Replaced the entire box with an identical unit, re-added all my peripherals, and haven't had a problem since.

Thanks again to usasma!

Cheers!