We have a system running Windows XP Pro. Upon boot you cannot launch any
programs. The mouse moves fine but left and right clicking does nothing.
The 'Windows key' does nothing. The only thing we can do is access 'TaskMgr'
via ctrl+alt+del. Therefore we know the keyboard and mouse is working. We
don't get any errors and do not see any strange programs running in the
'process' list. Booting in Safe mood presents the same results. Very
strange, any ideas would be appreciated.

Thanks in advance
Tony