Quote:
Originally Posted by theresthatguy
The only need to upgrade from 32 to 64 is if you have 4 gb of ram. I've ran both 32 and 64 versions of ultimate on my PC and they're the same.
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Thats because you probably didn't use any 64 bit applications.
To answer the OP's question, yes you should format it prior to installing a new OS, it will prompt you during the install anyways and takes under 30 seconds.