No mention of the malware's name but if you google XP REPAIR INSTALL that's a common fix. If the OS has failed and you need to get your files out, many boot up an UBUNTU CD (see google) and drag the files off.
Then they can reinstall.
An preemptive answer to the "I don't have the XP CD" is that we need one or those restore CDs to recover the machine after we get our files out safely.
Cursor. LOOKSlike a dos only cannot interact