Yesterday i noticed this file on my c:\, and the pc just started dying on me, I was going to format it anyway so i did backup of a couple of things and proceeded to format the hard drive, installed everything, and I use avast, but today only some hours after formating this file was back on my C:\, wsusupd.exe he ruined my avast didnt let it start, i cannot delete the file i have used adware removal from lavasoft, he deleted a couple of spyware, i also used prevx, but prevx keeps on detecting the files, deleting them and then reboots the sytem and the files come back again, i also used sophos rootkit removal but he didnt even detect anything, im kinda desperate, pls help me