I set up a dual boot for win 7 from vhd on 2 xp machines. One of them everything went fine, and I get the option to choose the os when I turn the machine on. The other was slightly different in that rather than seeing the current OS disk (the one with XP on) as the c:\ when I was setting up windows 7 vhd during install it saw the disk as d:. I didn't think anything of it and went ahead and created a vhd on the d: drive.

Now when I turn this machine on, it boots straight to win7 and I never get the option to choose xp. When I look at the boot option in msconfig, I only see Windows 7.

How can I go about adding the old XP drive as a boot option at startup again?

Edit: Strangely when I rebooted this time (perhaps the first time since I removed the install DVD) it boots to XP. I suppose I'll just have to reinstall windows 7 again in a new vhd...