Unstalled a program under control panel option and rebooted system. At
first, windows started but immediately after the desktop was displayed, I got
a blue screen error messege, system immediately rebooted and checked my
external HD for errors - none found. This happened about 5 times. Now, on
boot, lights on my keyboard blick once as if the system is starting but,
Windows does not start or anything is displayed on my display.

The system will not recognize a CD or flash drive.

OS: Windows XP (SP3)
Mem: 3.75 g