worm.win32.netsky on my computer..plz help

Hi, please can you help me get rid of this virus?? Worm.win32.netsky

I have tried for a week now but i dont know what im doing!!!

I dont know where i got it from but i cant erase it, i have tried using smitfraudfix and it has gone temporarily but when my computer has been turned off and then turned back on next time, the malware has returned.

I really need a step by step guide to remove this properly....can you help plz??

Thanks in advance

:wave