how to prevent profile corruption

:::::hi, one of my system(windows XP) profile corrupted automatically. Actually i don't know how it is done. But i have taken my files from that profile(my documents, desktop and from etc.. folders). My doubt is why automatically profile corrupt in windows XP. It is not a first time... many more times.(Many more times means one time in one system. not many more times in one system)it has happened. please help me....::::::

that is system has no virus-malware-rootkit etc.. i am using quickheal antivirus.

And how to prevent automatic profile corruption. Is there any solution for that.