Hi Mugalai and welcome to PC Help Forum!
First let's see if you can boot into Windows XP Safe Mode
Starting the Microsoft Windows XP Operating System in Safe Mode:
Turn on the computer
Immediately begin tapping the <F8> key.
Use the arrow keys to highlight Safe Mode and press the <Enter> key.
If you are able to boot into safe mode, have a look at the devices list - right click "My Computer", properties, hardware tab, device manager. See if there is anything obvious in there and fix what you can. Re-boot and see what happens....let us know
