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I think ubuntu is using grub2 now and not the old one, the grub2 is a complete re-write and does things differently.
grub2 installs some file/s to the mbr of the drive, and that is where the error message is coming from.
Although I have very little experience with win7 (had the beta installed for a year) I generally (when required)
install windows is a similar manner.
One way to rewrite the mbr is with dd and there are other ways to do it with formatting/partitioning tools.
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another way to rewrite the mbr from gnu/linux is dd.
of the 512 bites of the MBR, the partition table resides after 446 bites, so this will leave the partition table alone and write the rest.
dd if=/dev/zero of=/dev/hda/ bs=446 count=1
ref. http://www.linuxquestions.org/questions/linux-software-2/using-linuxs-fdisk-to-erase-or-fix-a-mbr-300256/#post1526191
to rewrite the entire mbr, use 512 instead
ref. http://www.cyberciti.biz/faq/linux-how-to-uninstall-grub/
(please note, If you have only one partition there is no partition table to damage or wipe!)
This will remove grub2 from the mbr, then you should be right to go on from there with the windows7 install.
The cd missing error maybe caused from the windows disk not knowing about your new (3 months) gigabyte motherboard chipset
used for the sata controllers. once the OS takes over from the bios
I generally slipstream the driver into winxp(?) with
nlite
I hope this helps,
regards Glenn
