Please forgive the vagueness of the following description of my problem, but I don't know any more than what I'm about to write. Someone gave my friend a used HP Pavilion computer. It was running slowly, so she asked me to help. The computer had not been used in two or more years and needed an antivirus program, firewall, etc. After I installed the Comodo firewall, I checked the applications that were running in the memory. I was given the choice of terminating or of terminating and blocking. I chose the terminating option and eliminated about 10 unnecessary applications. That did speed the computer up, so I shut it down , restarted it, and checked to see that those same 10 items did in fact reappear on that list. Since terminating them had not affected the computer in any way, I decided to terminate and block them permanently. Just as I was clicking on one of them, my friend came up from behind, and startled me. I guess my mouse hand slipped and highlighted the wrong application, and I accidentally terminated and blocked something that had to do with system32. A box popped up saying that the computer was getting ready to terminate the application and restart in 60 seconds. (I think that was how long) I tried to stop that termination but could not find a way to do it. Suddenly the computer shut off without shutting down WindowsXP. When it restarted, it put up the HP logo screen followed by the WindowsXP logo screen (the one with the little bar that moves back and forth) that comes up before the computer starts. When that disappeared, the only thing left was a black screen with the white mouse pointer. I could move the pointer with the mouse. That's it. I held down the power button on the CPU to turn it off, but when I started it up again, the same thing happened. The original owner of the computer doesn't have the XP installation CD. Is there anything I can do to bring this thing back to life? Any help will be appreciated.