Tim R wrote:

FWIW, I did some research on how to install Win 7 again, and it appears to be near impossible without the product key. That's long since lost, which is too bad.

That's why I've been buying off lease Dell Optiplex 780 computers.
Shove a Dell restore disk into the drive, and let it take care of
everything, including installing the corporate key for XP or Win 7.

I just bought another on Ebay for $43.71 delivered. It has 4GB of
RAM, a 250 GB HD and a DVD-ROM. It will be used to control a Vinyl
cutter for a local company that makes canopies for art shows. I got
several XP restore disks for free, and I paid about $10 for the Dell Win
7 disk.