I'm not sure this is the expected result. As for deleting Ubuntu, Windows can do it, no sweat - in fact, you can't remove Ubuntu from within Ubuntu without major hassle.
Now, if I understand correctly, you have a recovery disk from Acer, and a Windows XP install (not recovery) disk. I'll go with the install disk, since recovery disks are more often than not crap, and Acer's just plain don't work.
Boot from the Windows XP CD. You should get a text-mode, white-on-blue install screen (if you aren't then it's not a Windows install disk, it's probably another recovery disk). Follow the instructions until it asks you where you want to install it; it should then detail your hard disk's partition (2 or 3 of them, listed as 'unknown'). Delete them (if I remember correctly, you need to select them with the keyboard's arrows, then press D, and confirm). Then, once the drive has only free space, press Enter: the installer will create a partition that fills up the disk, and asks you to format it. Do a fast NTFS format, the system will then copy files, reboot. and finish its stuff.
Good luck locating the drivers, though.