Windows Update Does Not Like GRUB

“If you are running a multi-boot configuration with Windows and
Linux, and using GRUB as the bootloader, you may be headed for
trouble. I first ran into this problem about six months or so ago,
but I didn’t realize what it was until a few weeks ago. I have been
running this kind of configuration (Linux and Windows multi-boot)
for several years with no problems until this came up.

“The first symptom I saw was with installation of Vista SP2, on
two of my laptops – the ASUS N10J and HP Pavillion dv2-1010ez. Both
came preloaded with Vista SP1. Because I was going to lend at least
one of them to someone who wanted to use Vista, last fall I decided
to update them both to Vista SP2. Both had the same problem – after
thrashing through a LOT of other updates, Windows Update finally
offered to download and install SP2. It then spent a very, very
long time thrashing around, until it finally said installation was
complete and it needed to reboot. When I let it reboot, it went
through the “Installing Updates, Please Wait… Phase 1 xx% Done”
malarkey, then “Phase 2 xx% Done…”

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