Thanks justapost,i did it already through the WinXP update utility.It took some time(seemed like forever lol),but now i am on ver 406.I have one problem with Realtek Sound subsystem,refuses to load the drivers(tried new and old ones).WinXP had nforce board with older Realtek sound card integrated but i cleaned it beforehand.Now i might try in safe mode since i lost sound .

Didn't try the serious OC yet.I did notice the absence of very important tRC subtiming change in BIOS .

Thanks for your help,both of you,it's very appreciated.