Restoring Windows MBR over GRUB stage 1

I have a two disk setup with Windows on /dev/sda and Linux on /dev/sdb

GRUB stage 1 is in the MBR of /dev/sda and boots each OS by directing
to stage 2 on /dev/sdb

I now wish to entirely remove /dev/sdb but continue to boot Windows
from /dev/sda

I guess I need to do one of two things. Either...

1. Get GRUB stage 1 to boot Windows

...or...

2. Restore the native Windows bootloader to the MBR on /dev/sda

The problem is that I have no idea how to do either.

Can anyone help ?

Thanks very much.

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