Answer Best answer as chosen by user Snooks
Sorry for the CAPS, but you need to beware the problem.
If you install XP after Win 7, Windows 7 will become inaccessible.
The proper way to set up a dual boot is, install the older OS first then the newer. This is because the last OS to be installed replaces the boot record file on the first one's partition or drive. XP will replace Win 7's BCD, (Boot Configuration Data), with it's own boot.ini file, and Win 7 will not boot from that, even though it has an entry for Win 7.
I have not personally seen an XP OS successfully boot from an external drive.
So the options are;
1] If this Win 7 is Windows 7 Professional, Enterprise, or Ultimate, then it is possible to download and install Windows XP Mode from http://www.microsoft.com/windows/virtual-pc/download.aspx
2] See if the games can be installed in Win 7 using the Compatibility wizard.
3] Install XP onto a new drive, but remove the Win 7 drive beforehand. Then reconnect the Win 7 drive and use the BIOS Boot Selection menu, (available on most BIOSs by pressing an F key at power on, to select which disk to boot from. I know that works as I have just discovered it myself on my own system, (courtesy of fellow Moderator, Kees).
There may be other problems, eg installing XP with drivers, but you may already know about that.
I hope that helps.
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