You should ask Symantec about it. I think it may be related to the fact that these updates replace system files and modify many system related registry keys. Also they use exactly the same structure as M$ official updates but the difference between them is that M$ updates are digitally signed while mine are not. The two are completely different. Unofficial Updates Rollup (UURollup) = a rollup of unofficial updates Update Rollup 2 = a rollup of official updates & hotfixes They are complementary. EDIT By the way, which files exactly are reported as malware?? Out of curiosity I've just scanned the newest update created today through Virustotal Oh well that makes sense, but its mainly trying to download them, either by the link you give to your download such as UURollup9b or when its in the process of downloading and Norton cuts the download off And thanks, which one should I install first the Update Rollup 2 or UURollup9b? or does it even matter? Also by the way is there a precise way to install the files, cause every time I install the files such as UURollup9b and reboot, it comes back as a winlogin error and automatically restarts and does not go into Windows 2000