If I uncheck "Floppy Image" in the grubinst_gui.exe Grub4Dos Installer 1.1, I get the error "grubinst: Should be a disk image"
If I leave it checked, it looks like it installs fine, but when I boot onto it I get the error:
"Disk Error
Press any key to retry" [Or reboot, I forget, and I don't have it set up now to test]
I'm on XP right now on an Administrator account, and I tried on my XP laptop as well as a friend's XP desktop and get the same errors.