Uninstal Ubuntu and delete grub, and the partitions without deleting windows.
 

Someone that wanted Ubuntu for awhile, tried it installed it, just to get the full feel of it, I left the windows side intact, and now they want the linux side deleted, and everything back to the normal windows format, is there a way to do it without installing Windows XP again?

Boot into windows and:

- cmd prompt > fdisk /mbr
- Disk Management - delete partition

should do the job

hth