More than likely a computer currently running Windows XP will not have the "juice" to run Windows 7 (I assume this is an older computer hence the Windows XP part). Your absolute best bet to get the performance you would want from your server computer and to maintain the ability to go back to 6.3.3 if you need to would be to use a new computer for the new server and just turn off the Windows XP machine and hold on to it. After a few days, if that, you should know for a fact if you can dispose or recycle that machine.
This may not be the approach you were hoping for, but it is the only approach that guarantees you the ability to go back if you need to.
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