My new PC
SPECS:
Core i5-750 CPU
2Gb Kingston DDR3 RAM
1Tb WDC WD10EARS Hard drive
Gigabyte H55M-S2H Mobo(Bios F5)
coolermaster 600W power supply
1GB XFX raedon 5770 Graphic card

is behaving strangely.
I have installed Windows XP SP2(3 times)with Microsoft Security Essentials and all other Necessary softwares.Have cleaned Registry nearly 100 times and Updated Drivers every time...