I have purchased a laptop that has Windows 7 Home Premium OEM.
I have also purchased a Windows 7 Professional Installation CD.
Can I just put this CD into the drive and load Professional over the Home Premium that is currently on the laptop?
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If you mean upgrade (so you won't lose any data): Yes, you can. Just pop in the disc, and the installer will have an option "Upgrade".
(This is the so called "Anytime Upgrade".)
Absolutely. Just wipe the disk and start over, no reason to keep any of the garbage that came on the system either. A fresh load of vanilla Windows 7 Pro out of the box will run circles around an installation from a manufacturer laden with a zillion software installations you'll rarely use.
If you mean can you upgrade to it. Probably (though with "Windows Anytime upgrades" out there, i'm not entirely certain if an upgrade from Home Premium OEM to a full on Retail Pro Install will work, but most likely the upgrade option will be there when you insert the disc), but I still don't recommend it. MUCH better to install fresh and only install any drivers or utilities you will NEED or WANT.