Comment 9 for bug 410548

As a workaround, you should try chainloading Grub2 from ntldr instead of chainloading ntldr from Grub2. This will remove the need of replacing the MBR, so Windows ME shouldn't complain anymore about a "virus" in your MBR. There are numerous tutorials everywhere on the Internet to do so.
Grub2 works just fine, and it is not the goal of the developper to make it stealth and able to pass through systems that do a MBR check on bootup. However, it is true that it doesn't support yet choosing the chainloading order and that it could be added to the wishlist.