Rebooting computers are a pain to diagnose usually. Anything can cause a computer to reboot: spyware, virus, faulty memory, failing fan causing overheating, bad motherboard or failing hard drive, plus any other component in the case. When it shuts down, does it just power off or does it give you a blue screen of death (blue screen with white text with stop error message on it)?
Just to see if you posted in the correct forum, I suggest you run an MBAM scan.
Please download Malwarebytes' Anti-malware
and save it to your desktop.
Double-click on mbam-setup.exe to install the application.
When the installation begins, follow the prompts and do not make any changes to default settings.
When installation has finished, make sure you leave both of these checked:
Update Malwarebytes' Anti-Malware
Launch Malwarebytes' Anti-Malware
Then click Finish.
MBAM will automatically start and you will be asked to update the program before performing a scan.
On the Scanner tab make sure the "Perform Quick Scan" option is selected then click on the Scan button.
If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.
When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".
Click OK to close the message box and continue with the removal process.
Back at the main Scanner screen click on the Show Results button to see a list of any malware that was found. Make sure that everything is checked, and click Remove Selected. When removal is completed, a log report will open in Notepad. Copy and paste the contents of that report in your next reply. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.
Edited by possumbarnes, 26 June 2009 - 12:04 AM.