If this is a problem you got after suddenly switching of your pc, without properly shutting down. Then here is the solution. Even safe mode may be not working.
- Insert your XP cd and boot from it.
- After booting from the cd select Repair option to get the dos mode.
- In the dos mode type ‘help’ to get the list of commands.
- Try the ‘logon’ or ‘fixboot’ command, if it fails then there is a chance’s of problem being displayed there itself. For example it may display that there is a problem in logging in, Reason may be corrupted file system so use chkdsk command.
- Here use chkdsk (Check Disk) command to repair any corrupted file system.
- Now use fixboot command to fix any damaged boot sector.
- Use any other command depending on your need.
- Now again try to use ‘logon’ command, now you should be able to logon. This means your problem is solved.