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I have a dell optiplex gx280 and it had windows xp on it till it refused to work so i installed a toshiba windows vista back up cd.
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Sorry but what you are for asking is help in pirating a copy of Windows. Not cool. Beyond the illegal license issue, note that OEM versions of Windows, particularly those used for notebooks, are often branded and "customized" to work only on their brand - this is often out of necessity as notebooks tend to use proprietary parts.
If you want to try another operating system, you will have to buy a "retail" version of Windows, or use one of the many free versions of Linux.