Hello – I’m currently using a Dell Optiplex 755.

-Microsoft Windows XP Professional Version 2002 Service Pack 2
-Intel Core 2 Quad Q6600 @ 2.40 GHz
-8 GB of RAM (only 3 GB appears)

I have "Microsoft Windows Vista Ultimate x64 Edition – for Upgrade Use Only (Product Key Required)"

When I insert the disc and open from My Computer, I get this error:
"Setup can not run on this version of the Operating System. To install Windows please try booting from the install media."

I inserted the disc and restarted the computer, but it did not begin the installation.

What can I do to fix this problem?

Thanks for reading.