I have just finished doing a scan with spybot and I got the message saying spybot needs to do a scan when windows restarts.

Although, when I restarted the user screen comes up and when I click on a user the wallpaper & mouse cursor loads and that's it - no start menu or icons.

I can get the task manager up and run programs from there.

I remember having this issue (or similar) on another PC quite a while ago and I think I had to remove the registry entry that tells windows to run spybot before fully loading.