Unable to install windows xp

Hi all...
I've recently purchased a laptop that came with freeDOS pre-installed. Now when I try to install windows xp it says that windows could not be installed.
By the way what is freeDOS anyway??? Well for the time being I'v installed Ubuntu 11.10 on it but also want Windows. I'v kept the partition containing the DOS and had installed Ubuntu on a separate partition. I thought to first ask the question here and delete it (the dos partition) only after I'm sure.
plz help...

Thanks in advance... :)