|mmm a little more imnformation would be useful to start with?|
What make/model of computer.
Can you boot to the normal desktop OK?
Can you see all the usual icons etc; and can you run "anything" on the system?
Was anything happening before this problem?
Any error messages at all?
Do you have an XP setup disk (full or upgrade); or do you have only a recovery disk (if any disks at all)?