|"U need to go to the safe mode and restore your system to earlier good condition!"|
Remove any bootable CD or DVD.
Press F8 repeatedly while booting.
When the Windows boot choices menu appears, choose
"Last known good...."
If you do not see that on the screen, you need a Windows XP CD that you can boot the computer with in order to possibly fix your problem without needing to re-install Windows from scratch.
You need to try going into the Recovery Console and running CHKDSK /R