It would be a poor bios config that didn't boot from CD
by default anyway.
Just put in the CD
, start/restart your PC
, and see what happens.
Bear in mind that Knoppix (as any non-microsoft OS
) will have some difficulty with NTFS. It's likely that your current partition[s] is/are NTFS.
If you just want an OS
I would recommend trying to obtain WinPE instead. It's a very stripped-down XP
that will also boot from a CD
, and of course will have no difficulties with anything that your static XP
installation has left on the hard disk. Standard footprint is about 100-130Mb so there's plenty of room on the disk for other stuff - recovery tools being an obivous choice.