Grub question

[Don Benesch]

I am replacing my Linux drive in my dual boot machine with a newer one, and I'm using Grub as my loader.  I want to keep the windows drive, but when I remove the old drive and install the new one it hangs on boot. 
If I use fdisk /mbr from windows will that disable Grub and allow me to boot to windows? Would this be the best way to install the new drive and leave the windows drive un-damaged?
I would like to install the new drive and re-install RH 7.2 and set up Grub again.
Thanks
Don