I installed office xp to my computer and downloaded a crack for the activation code, when i set up the activation code i was told to restart my computer. When i restarted my computer it came up as normal and then i got a blank black screen with my mouse pointer and the computer just restarts again. I'v tried everything to try get it working again and when i get to the a:/ it says that the C:/ is an invaled drive. All my files and music is on my HD and i don't want to format it, CAN ANYONE HELP ME? Thanks