If you can get it to boot up to safe mode by pressing F8 during Windows bootup, you could try using your System Restore Point to go back to a ealier time before your problems.
How to start the System Restore tool by using the safe mode option with the Command prompt in Windows XP
A description of the Safe Mode Boot options in Windows XP
Troubleshooting steps for issues when you try to use the System Restore tool in Windows XP
Method 5: Boot in safe mode and run the System Restore tool
To boot in safe mode follow these steps:
1. Restart the computer. Immediately after the screen goes blank for the first time, or after the BIOS post ends, start taping the F8 key repeatedly. The Windows Advanced Options menu appears.
If the menu does not appear, restart the computer and try again.
2. Select Safe Mode, and then press ENTER. As files load they will scroll down the screen.
Note Safe mode uses a minimal set of device drivers and services to start Windows. The default Microsoft VGA driver is used for display at 640 X480 resolution and in 16 colors.
3. Log on to the Administrator account. If a password was never set, leave the password blank and press ENTER or click the green arrow.
4. Click No in the safe mode information screen to start System Restore.
5. Select Restore my computer to an earlier time, and then click Next to proceed to select a date with restore points available.
6. Click Next to begin restoring the system to a previous state.
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