can't access Win ME on C:\ after installing XP on D:\ (invalid system disk)

Hi,
after installing Win XP (works fine) on D:\ for a few times I still could boot into Windows ME, which has been on C:\ for a couple of months.
After some time however I sudenly wasn't able to boot into ME any more, I only get the message "invalid system disk, replace disk and press any key ". If I press a key from there I will boot to WIn XP and not into ME.
As I said, XP works fine, I just can't access Win ME any longer! Is there something wrong with the MBR ? What can I do ? Please help!

 

mbr

You may have a master boot record buggerd. But here is what your boot.ini should look like, note: mine has win98se + winxp.

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(2)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS= "Microsoft Windows XP Professional" /fastdetect
C:\= "Microsoft Windows"

My "C" is win98 yours would be ME