|I am not sure we would help with this. |
If you are brave you might consider reading up on how to do "repair" using the original XP cd.
If you have OEM DVD's or other "restore" disks you may have to use them. All of your data will be lost unless you use a live cd to transfer off the personal data to usb or network.
Might have to take it to a shop or find a neighbor that might know how to use a live cd to save your data. Then repair or restore.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10