windows vista- a hanging garden

[rsty]

its true that my windows vista home premium has now become a hanging garden. the moment i leave it for 10 to 15 min without doing any work on it or if there is no input from my side for this duration it hangs and crashes. it has to be restarted to resume my work. i have been avoiding re installation of os since i have quiet a bit of data and softwares installed on this which will get lost if i go for formatting and re installing.
i thought of some virus attack also and purchased an antivirus which gets updated online regularly. even this was of no help.

pl advise what possible options do i have?

[tweakwindows]

May I know which antivirus you have purchased? Have you upgraded to SP2?

[HappyAndyK]

Could be a Indexing Service issue or some crapware problem.

See if Windows 7 or Vista Freezes Frequently helps you.

[rsty]

its guardian from quickheal. i am pretty satisfied with the antivirus. i think so i have upgraded to sp2 since it automatically download updates.

May I know which antivirus you have purchased? Have you upgraded to SP2?

[seti]

If you go to the welcome centre, it will tell you if you have service pack 2 installed or not. If not install it right away.

[rkonit]

Your HDD may have got bad sectors... scan for errors.
Run this for C drive under elevated CMD

chkdsk /r /x

OR
Windows System files may have some invalid signatures.
Run this under elevated CMD

sfc /scannow

It validates the digital signatures of all of the Windows system files and restores any that it finds are incorrect.

[rsty]

thanks all of you guys
i am trying all solutions one by one and hope the problem get solved