Extracting Windows 7 from HP Touchsmart?
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If however, both the HP machine and the Dell machine are both licensed in the BIOS for the same version of windows 7 OEM, it is possible to use any windows 7 disk (even a retail copy), but you would have to change the serial number and the certificate, and install the proper version. The certificate is OEM specific, and the serial number is OEM & Version specific.
Your best bet is to pick up a copy of windows 8 pro upgrade for $40 that should be available starting Oct 26th and install that on the Dell Dimension 5150. The $40 price is only good through microsoft's website and only for a limited time. This sounds like a sales pitch.... but I'm considering picking up a copy or 2 of windows 8 even though i'm in no hurry to upgrade from windows 7. If you really want to avoid windows 8 and stick with windows 7, i'd suggest buying a copy ASAP.