PC freezes and restarts on occasionally

[sbcal]

After changing the fans in my computer, it now freezes after several hours of usage. This can occur within 2 to 3 hours. No errors nor blue screen of threat appears, just mouse and keyboard cannot be used. After it restarts, it runs finish for another hour, then it restarts. Problem had occurred after I had changed the rear case fan (Antec 20mm Blue LED) and CPU fan (Rosewill 92mm Ball CPU Cooler). The previous had a CoolMaster Liquid Cooling Sytem which had die on me. Any help would be much appreciated, specs are below:

Asus P5N-E nForce 650i SLI Chipset
2x1GB PC6400 DDR2/800 Dual Channel Memory with Aluminum Cooler
Windows Vista Home Premium (32-bit Edition)
Intel Core 2 Quad Q6600 @ 2.4GHz
20X Double Layer DVD+-RW
500GB SATA-II HDD with 5.25" HDD Cooler
700W PSU
2x NVIDIA GeForce 8600 GT
Antec 20mm Blue LED
Rosewill 92mm Ball CPU Cooler
PCI Slot VGA Cooler

 

[raybay]

Nice system. Congratulations.
Post all logs but not the ones you have already posted.

Here is a form of the 8-Step infestation removal, as we may have to use it to remove some possible problems. A lot of what needs doing are step by step procedures to get to the cause of the problem... You have a nice system. Something there is not working right, but it could be an infestation, or a memory module, or any other device installed. It may not be easy to find.

What is the brand and model of your power supply?


After the above is done and Logs attached do the below!

Download SDFix to Desktop.

http://downloads.andymanchesta.com/R...ools/SDFix.exe

On Desktop run SDdFix It will run (install) then close.

Then reboot into Safe Mode

As the computer starts up, tap the F8 key several times.

On the Boot menu Choose Safe Mode.

Click thu all the prompts to get to desktop.

At Desktop
My Computer C: drive. Double-click to open.

Look for a folder called SD Fix. Double-click to enter SD Fix.

Double-click to RunThis.bat. Type Y to begin.

SD Fix does its job.

When prompted hit the enter key to restart the computer

Your computer will reboot.

On normal restart the Fixtool will run again and complete the removal process then say Finished,
Hit the Enter key to end the script and load your desktop icons.

Once the desktop is up, the SDFix report will open on screen and also be saved to the SDFix folder as Report.txt.
Attach the Report.txt file to your next post.
=========================================
Download ComboFix

NOTE: If you have had ComboFix more than a few days old delete and re-download.

Get it here: https://www.techspot.com/downloads/5587-combofix.html
Or here: http://subs.geekstogo.com/ComboFix.exe

Double click combofix.exe follow the prompts.

Install Recovery Console if connected to the Internet!

When finished, it will open a log.
Attach the log and a new HJT log in your next reply.

Note: Do not click combofix's window while its running. That may cause it to stall.

 

[sbcal]

Thanks! I was able to resolve the issue, appears that there was a hidden trojan which was causing the issue. Usually scan the system with Spybot, however, it did not detect it. Found two other wonderful programs, SUPERAntiSpyware and Malwarebytes Anti-Malware that did the trick. System appears to be cleaned now and has not froze or rebooted since. I will continue to test and post logs if issue reoccurs. Appreciated the help so far.

Also, SDFix does not appears to work in Vista Safe Mode. The programs runs, screen appears and closes after a few seconds. Any ideas?