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If you already have a operating system on it, put in the Windows 7 DVD and hit setup. If not boot the DVD.

Some PC's require you to enter BIOS(default F2/DEL) at boot to put boot priority or enable the boot option button(default F12).

Keep in mind your PC must meet the required hardware for Windows 7 to install it. If this question is referring to the Dell OpiPlex you might have to do some prework to get it going with decent performance.

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12y ago

What else can I help you with?