When I run Spybot, it gets to the part where it looks for a piece of spyware called 'virtumonde.dll' and then hangs. Why doies it do this? Curiously, it happens in Safe Mode too.
The VundoFix tool detects nothing; but why does it hang?

Windows XP SP2
512MB
SpyBot 1.6.0
AVG 8
Windows Firewall