Just recently my computer has started locking up for no apparent reason. Everything just freezes and i have to manually reboot. It happens whether i'm playing a processor intensive game or if the computer is at idle (sometimes i leave it running while i'm at work, come home and its frozen). not really sure what could even be causing this problem and its hard to tell cause nothing seems to directly cause it. It started just recently and so i though it might be RELATED to the UPS i just got recently, i uninstalled the software it came with, but still same problem. Any ideas? I have a 2.2 GHz process with a gig of ram. Tell me if you need any other info. Thanks.You have scanned for Viruses, Trojan Horses and Spyware?

Try testing the RAM with this tool.

In case you haven't seen my list yet:

Virus scanners
AVG Free
-- Anti virus scanner
Trend Micro Housecall
-- Online anti virus scanner.

Anti spy/malware
Microsoft Antispyware
-- Anti spyware scanner. Windows XP Home and Professional only.
Spybot Search & Destroy
-- Anti spyware scanner
Adaware SE Personal
-- Anti spyware scanner

Firewalls
Use both a hardware and software firewall.
Be advised as dual software firewalls may cause problems

ZoneAlarm Free
-- Free firewall - more user friendly
Sygate Personal
-- Free firewall - more configuration options

Removal tools
The following files are not substitutes for the ones described above.
They are either diagnostic tools or removal tools for malware of a certain kind

HijackThis
-- Manual malware remover. Post the HijackThis log generated only if requested!
McAfee Stinger
-- Virus removal tool. No substitute for a fully functional virus scanner!
CWshredder
-- CoolWebSearch removal tool. Widely known and persistant Hijacker.control panel admin tools events log may tell you more?yeah i initially thought it might be that, i've scanned with updated AVG antivirus, ad-aware, and spybot and found a java/open stream virus. i have the basic windows firewall and  the windows memory diagnostic found no errors. i checked the event viewer but all that was in there was one warning that said:

Windows saved user COMPENGINEER0\David registry while an application or service was still using the registry during log off. The memory used by the user's registry has not been freed. The registry will be unloaded when it is no longer in use.

This is often caused by services running as a user account, try configuring the services to run in either the LocalService or NetworkService account.

Any other ideas?sorry, there was one other warning in event viewer from source ati2mtag that said:

SRB command failed – SRB_GET_DEVICE_PROPERTY

not sure what this means but my graphics card is an ati all-in-one-wonder 9600CompEngineer:

SRB commands have to do with video cards:

http://www.microsoft.com/whdc/archive/i2c.mspx

Perhaps your video card driver is CORRUPT?  Try checking the video card or CONTROLLER in the Device Manager for any information about the device not working properly.  Also, try downloading and installing the latest driver for your video card that is compatible with your operating system.

Regards,
DocA. Click Start, click Run, type msconfig
> B. Select "Selective Startup" and remove the check box for "Load Startup
> Items".
> C. On the "Services" tab, click ENABLE All.
> D. Check "Hide all Microsoft Services", click Disable All and clear "Hide
> all Microsoft Services".
> E. Click the OK button and then Click Yes to restart your computer.
CompEngineer:

One way to test to see if it is the video driver is to boot the computer into Safe Mode (which does not use the video driver, but uses VGA mode, instead).  Press F8 during boot, and choose Safe Mode from the menu.

If your PC still locks up, then it is not the video card driver.  To rule out the video card, remove it (that is, if you have an onboard video controller).  

Regards,
Docwell i did the msconfig and updated my drivers like you said, so now i'm just going to wait a little while and see if it happens again.Do not use default Windows drivers.I do, and I can't get any updates... Quote

I do, and I can't get any updates...