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14 May 2012  
gregrocker
Microsoft MVP

 

As stated you must do a Clean Reinstall to change from 32- to 64-bit.

As it states in the tutorial I linked for you you must back up your files and reinstall your programs: Clean Reinstall - Factory OEM Windows 7.

Nothing will be saved which you do not back up first. Read the tutorial, which is the same for retail as for Factory OEM.
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