Forum Moderators: bakedjake
Stands to reason that you need to offer the system an alternative to what it already knows, doesn't it? ;)
Actually, I don't think it really boots Linux now. It just attempts to start the previous bootloader (Lilo or Grub) from the MBR, but probably fails with that rather soon because the OS itself is gone. Overwriting the MBR for Windows will fix that. Of course you also need to actually install the Windows system, but I assume that is obvious...