I've never had any problems with nullsoft/winamp, at least not of this kind.
I googled some info on them,
Win32.Worm.VB.DW seems to spread via P2P, so that one is quite unlikely to come from Winamp.
The other one is not too well documented, but I found that it's also known by some other names
quote:
Submission: 235176
Sender: Jotti
Added: Trojan.Servu.27
Virus name alias: Trojan-Dropper.Win32.Agent.amr (Kaspersky AVP),
Trojan.NtRootKit.40 (Drweb), Backdoor.Servu.AJ (Bitdefender)
So I googled "Trojan-Dropper.Win32.Agent.amr" and it came up with
this site (among others ofcourse), which states it can be removed with
Spyware Doctor
Good luck
/ 
