Its a particularly nasty bug.
To deal with this thing,
(In Safe Mode preferrably, which I had trouble accessing, so didn't bother)
I got a copy of Autobit BD remover, an Indian antivirus agent .from http://rapidshare.com/files/82472644/autoit.bd_worm_remover.zip.html
Initially I were quite worried, because for a virus remover it looks quite comedic, and not that different from the Funny UST virus icon
- Open Registry Editor (Start>Run>regedit)
- Delete the key HKEY_LOCAL_MACHINE\Software\ Microsoft\WindowNT\CurrentVersion\Winlog
- Delete the key HKEY_CURRENT_USER\Software\
If this appears on yours I'd seriously recommend sorting it out sooner rather than later.