glad you got it fixed but I think that fdisk /mbr was never going to work in xp or w2k
my usual route of salvation is fixmbr at the win2k (so probably xp too) command line
for those running either of the two try dropping to dos and typing help and it'll show you the post 98 dos commands
let me know if I'm wrong but I'm fairly sure that this works - failed solaris 8 and linux installs on win2k machines