I may have a similar problem. My laptop a Acer Travelmate 5310 crashed. When I restart I get a black screen, just the mouse pointer is visible. It crashed when I my Firefox crashed on one page
audioScope and I turned of the NO Script java extension of Firefox.
After that I opened Lavasoft Ad-Aware Free edition but this time all the applications stopped responding so tried to open the task manager but everything failed.
Vista Basic just won't startup - I still have the black screen in front of me.
By the way I have just logged in on this board with my XP Professional Minitower Desktop PC.