http://www.microsoft.com/security/po...in32%2FSmall.R
When you did the clean install, was your system connected to the internet? The first thing you should do is install all service packs (and hotfixes if available) and install antivirus/antispyware BEFORE connecting to the network.
Worm_small.hyn is transmitted through flash drives, so you better check that your drives aren't infected.
At this point, you probably want to start a thread in Viruses/Trojans/Spyware, since this is no longer a backup question.
