how i can restore my windows xp ?

System restore is a component of Microsoft's WindowsXP operating system that allows for the rolling back of system files,registry keys,installed programs,etc,to a previous state in the event of a failure.System restore is accessed via the Start menu, in Start-All Programs-Accessories-System Tools-System Restore.From there, the user may either create a new restore point manually, roll back to an existing restore point, or change the System Restore configuration.System Restore is configured to use upto a maximum of 15% of the hard disk space.Old restore points are discarded in order to keep drive usage within the specific amount.When a rollback is performed, files with certain executable extensions are restored and newly-created folders are removed, but items in the My Documents folder are always left untouched.

you can use the bootable cd of windows XP and through it you can follow the instructions and can retore the default settings of the same.

Do you have a the xp disc or recover

Start All programs Accessories System tools system restore. Then as long as you've had it turned on it will give you the option to restore to a previous time.