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If it doesn't you might need to do a phone activation but since you've already installed Windows 10 on the same machine it should be registered in the Microsoft Once Windows installs it should check with Microsoft and reactivate your new 64-bit version. When it asks for a product key/activation key, skip that. Let Windows install over the previous installation or do a quick format to make sure it is gone. If you have already installed all your programs, data and files you'll need to back those up as they will get lostīoot from the install media and make sure you are installing the 64-bit version. Then check: Settings->Update and Security->Activation and make sure your version is activated. (Processor should be listed in this same Window that describes the System type). Post the processor and we can figure that out but the above check should tell you for certain. Your Optiplex 380 should have a 圆4 processorīut without knowing the exact processor, can't say for sure.

If it says x32-based processor, then stop right here-you can't install the 64-bit version to it-it won't work. Not have 64-bit you can download it using the Microsoft Media Creation Tool.Ĭheck your processor using: Settings->System->About and see that you have a 圆4-based processor. You will need to do a clean install, mostly the same process you did when you installed the 32-bit version. The Windows 10 install media you purchased should have both 64 and 32 bit versions on it.