Comment 17 for bug 410548

No one is faulty here.
* Grub2 is installed on the MBR to be the default bootloader of your system.
* Windows ME implements a protection scheme that check wether the MBR has been modified or not.
For some reason, Windows failed to detect Grub Legacy (well, there I can think that Windows ME was faulty here). But afaik, there was no workaround in Grub code to support Windows ME. Also, the MBR code hasn't really changed between Grub Legacy and Grub2, so I see ne reason why Windows ME complain. Have you checked if there's a way to deactivate this behaviour under Windows ME?
Also, if you are fluent with command lines, can you please send the output of the command (suppossing /dev/sda is your boot device)
~$ sudo dd if=/dev/sda bs=512 count=1 | hexdump -C
in these two different cases
* With Grub2 installed and Windows ME complaining about a virus in the MBR
* With ntldr installed (e.g. after a fixmbr)
This will dump the content of the MBR into hexadecimal.