Windows7 64bit: Computer freezes / no Bluescreen

Tina,
After noticing a couple of items in the speccy file, I must ask you to once again:

Install CCleaner:
CCleaner - PC Optimization and Cleaning - Free Download

list of STARTUP PROGRAMS

CCleaner | Tools icon | Startup button | Windows tab |
click on Save to text file button (bottom right side) |
accept Startup.txt as file name | SAVE button

list of SCHEDULED TASKS

CCleaner | Tools icon | Startup button | Scheduled Tasks tab |
click on Save to text file button (bottom right side) |
enter Scheduled Tasks as File name | Save button

List of INSTALLED PROGRAMS

CCleaner | Tools icon | Uninstall button |
click on Save to text file button (bottom right side) |
accept install.txt as File name | Save button


UPLOAD, as an attachment, the startup.txt file
UPLOAD, as an attachment, the Scheduled Tasks.txt file
UPLOAD, as an attachment, the install.txt file.

HOW TO UPLOAD
Post a File or Screenshot in Seven Forums

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On another topic, I'm having difficulty locating an official website for your motherboard and your bios is quite old. Most motherboard manufacturers would have released at least 2 to 3 bios updates in more than two years.

I can not determine the source of you problem. I have asked for help.

Very unusual for cool temps (and you need really cold temps to have problems) is the source of the problem.

Condensation resulting in shorting circuit paths would be a possibility but once again, that is unlikely.

Did you happen to run across any info that would give you a link to a site from the motherboard manufacturer or distributor to be able to fetch bios/driver updates?

Tina,
Did you check to see if this driver is newer than yours?

Treiber - Grafik (‏1)
Treiber-Update für NVIDIA GeForce GT-Grafikkarte ►
2010-04-19 , Version:8.17.11.9732, 154.03M
Das Treiber-Update für die NVIDIA GeForce GT 220-Grafikkarte
behebt das Problem mit einer verzerrten Bildwiedergabe und das Problem,
bei dem das System nach einem Systemneustart hängen bleibt.

Which is better I can't say. Generally, best is to use the latest driver offered by the computer manufacturer rather than the one from the graphic card/chip manufacturer, but not always.

True is also that your computer is not the latest and HP may be lax in updating info on an older computer.

I told the chaps who will be possibly making suggestions that you have much software that I would remove if it was my computer, but that such a suggestion would not be to your liking.

You might try uninstalling all software on there that you can live without and then remove still more.

Another holy grail for some is Avira. Generally, the paid version of Avira runs quite trouble-free under Windows 7.

As an experiment, you could uninstall Avira and install MSE, Microsoft Security Essentials. Link to MSE in my signature.

I'm a great supporter of MSE which is the one and the only anti-malware solution that I use, that I install, that I recommend. AV software has strange ways of interfering with other software.