XP is very MEMORY hungry ... 128mb will be very slow .. 256mb will be just enuff for normal app ,, 512mb would be ok .. 1gb for comfort.
Window 2000 would be a better bet..
If you have NOTHING you need to backup OUT of linux, you can just use the window XP/2000 cd and clear the partition then recreate one under NTFS or FAT32 and install it there.
Just boot the cd,install it... then when asked to choose partition to install it on, clear it.. and recreate it.
that should do it.
Lord of the sheeep