How to remove wallpaper shown on boot?

I have just cleaned up an XP laptop (non-domain) of a ton of virii. One virus changed a users wallpaper to a fake malware warning. I have changed to another wallpaper so that when the user logs in they get the normal tellytubby land.

However, when the computer boots, between the XP boot screen and the welcome screen, the warning wallpaper flashes up.

How do I change this?

TIA

Somewhere in the reg, Can't remember exactly.
Regedit
HKEY_CURRENT_USER
Microsoft
Windows
Wallpaper

Almost worth a search

Heh oh yeah thats a good idea. There's a few references to wallpaper, I'll trawl through to find the offender. Thanks.