Windows 7 boots but then black screen with mouse ???

[Doyne]

I can boot windows seven but the screen goes black when i select my user icon and the mouse pointer is visable and moves but nothing is there to click. I can get into taskmanager but there is nothing i can do there either. I have lost my instal/upgrade disk. This was an upgrade from vista.
Can u help or do i have to buy a new disk??

Thanks,
Doyne

 

[rgd1101]

safe mode work?