http://bugs.winehq.org/show_bug.cgi?id=13380
--- Comment #2 from Jos van Wolput wolput@onsneteindhoven.nl 2008-05-24 05:34:05 --- (In reply to comment #1)
Don't run Wine as root. And don't give yourself write access to hard drive. What all dlls did you override?
I never run Wine as root and did not override any dlls!
I checked the permissions of /dev/hda which are set to owner root: can read & write, group disk: can read & write, others: forbidden.
After removing myself from the group disk, the MBR is no longer altered and grub boots normally.
I still wonder the boot process could be affected by using Wine!
Thanks for your advice!