Chainloading Vista

[Matt]

Hi,

I have an issue with grub booting vista, instead of vista starting to
load the computer just reboots.

My setup is as follows:
2 SATA harddisks (AHCI), on the first (primary) partition of the first
harddisk is the vista install, then I have an extended partition and in
it a number of logical partitions for linux. So:

sda1: vista
sda5: /boot (linux)
sda6: /     (linux)
sda7: /home (linux)

Grub boots linux fine, but as I said, windows won't even begin to start.
Practically as soon as I hit enter on the vista menu option within grub
the PC reboots.

The vista entry in menu.lst is:

rootnoverify (hd0,0)
makeactive
chainloader +1

Any help would be appreciated.

Thanks,
Matt