I have also been running Windows 7 since the RC was made available.
But, I had to get a newer computer to be able to run Windows XP under Windows 7.
Yes, I had a fast computer - a Pentium 4 at 3.4GHZ with 4GB of RAM. But the Pentium 4 was missing one important thing: Virtualization Technology.
In order to run Windows XP (or XP mode) inside Windows 7, one must have a processor with virtualization activated.
You might want to check for additional information about your processor/CPU on the Intel or the AMD site.
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