My acer aspire 6500 gets stuck on the windows welcome page!

For some unknown reason I went to switch on my laptop and it wouldn’t go past the xp welcome screen and the mouse was stuck.

I’ve brought it into work for one fo the tech guys to look at it and we’ve booted it up in safe mode, and every other mode. It will start up but then once switched off again it has the same problem.

He tells me it’s because they’re too many programmes starting when the PC boots up but we’ve cleaned them all off and I’m still having the same problem. Any ideas?