Originally posted by jofice:[..]
Shite, meant to write that inXP
Solution: update to Windows 7.
hahaha... just kidding (although I really recommend you that)
It sounds like you have -accidentally or not- changed the type of log-on protocol you use.
It might have gone from this:

to this:

hasn't it?
I'm going to try to help you, but I use Windows in Spanish and don't know the English translations for all terms, try to guess what I mean if something is understandable

Go to Control Panel, and click User Accounts. Then click on "Change the way/manner/? that users log on or off"... There should be various options there, I think you should check the "Use the main Welcome screen for fast and easy logon" box...