If you do that, then WinME won't boot anymore, even if you installed it to D:\ it still places the boot files on C:\ I had a similar scenario when I first install win2k, then installed win98. Everything went wrong. You should do as LS Dragons said: 1. Format 2. create 2 partitions 3. install WinMe (if you must) 4. install WinXP - and it will set up dual boot for you. This is because WinXP will recognise WinME, XP is newer and knows about previous Operating systems, it cannot be done vice versa. There may be third party bootloader apps that will allow you to install WinME when you already have XP installed, try doing some research on Google, and check out PowerQuest's Bootmagic software.