My father has a dual-boot Vista/Fedora 11 machine, with Grub on the MBR. He recently enabled recommended updates in Vista, and it wanted him to install SP2, but he was unable to. At Stage 3, after rebooting, it got to 100% but then failed and reverted the changes. The associated error number was 80004005. We found that the source of the problem was that the active partition was the Fedora /boot partition, not the Windows one. By using Vista's Disk Management tool to make the Vista partition active again, the problem was solved. Grub doesn't seem to care which partition is active (at least if it's on the MBR). Looking at old saved fdisk output from 2 of my machines, I suspect that F11 changed the active partition, and that in F10 and earlier, the Windows partition was active. Is this new behavior in the F11 installer (to change the active partition, even though Grub doesn't care), and if so, is it deliberate?