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 You deleted some important system files apparently. There are two methods of repair you can try here. The first will require the Windows installation disk in order to replace any default system files with the system file checker tool included in Windows. With the disk in the optical drive(cd/dvd) simply type in "sfc /scannow" at the Run prompt right off of the Start menu and click ok or press enter to see that start running. After going through the file verification process it will generall recopy files to the drive. If not you would need to manually expand the files after booting from the XP cd to the recover console if you know the exact files deleted?
 
 The second method before needing a repair install of Windows is a quick trip into the device manager to right click on the drives seen in the "CD/DVD" section there for the properties menu to come up. The screen capture will show the uninstall button for removing the current drivers. Following this you restart the system and have Windows reinstall the drivers needed when the drives are redetected.
 
 
 The last option does require the original Windows installation disk in order to perform a repair install on the current installation. This repairs and replaces the essential files without deletions of existing folders and the need to reinstall anyhing more then video and sound drivers. 
http://www.michaelstevenstech.com/XPrepairinstall.htm