Can you boot into safe mode?
1.If the system is already turned off, power it on.
2.If the system is already on, shutdown the system normally, wait 30 seconds, then power it back on.
3.Begin tapping the F8 key every few seconds as the system boots up until the screen offering the Safe Mode option appears.
4.Use the arrow keys to highlight Safe Mode and press the Enter key.
5.The system will now boot into Safe Mode.
6.On Windows XP, you may receive a prompt asking if you really want to boot into Safe Mode. Choose Yes.