My pc automatically restarts after 1 and half hours whenever i use net continuously?

please tell me a remady for that problem

additional informations

using windows XP

using 480mb ram

updating antivirus software regularly and scan my computer

regularly and no threats have been found

after restarting there is a window showing that a "logoff error

has been created " and the "window have been recovered

from a serios problem"

please give me a remady soon

My pc automatically restarts after 1 and half hours whenever i use net continuously?best antivirus software

most probably it is a virus problem, if it is happening only when you are online. Try to disable system restore, then boot in safe mode and then run the antivirus/ antispyware scans, that might help. Or otherwise visit bitdefender website, and do a free online virus scan, it can be helpful

My pc automatically restarts after 1 and half hours whenever i use net continuously?firewall

Could be a series of problems. For beginners, try looking at anything that may cause your PC to overheat. Try cleaning out the heatsink on the CPU (the accumulated dust can and will defeat the purpose of the heatsing with a fan for cooling the CPU)...but while you are at it, try cleaning out the rest of the fans and inside the PC case. Do this with the PC disconnected from the power source and always ground yourself with the PC case (simply touching the case with one hand while working with the other is fine). The one trick I like to use is pressured air or a blower to get all the dust out of the case. The logoff error could be from an application not closing properly. This application could be a valid one or one that got left behing while un-installing some software. You can google for free registry cleaners that will run and check for registry problems that usually cause these type of errors.