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#11
I would also take the time to note when you started noticing things slowing down and some of the processes you did.
Windows 7 is currently using a feature called Windows Search. XP does not use Windows Search, it is actually something you add on and is used heavily by Outlook 2007. This requires doing some indexing of your system, which will try and not slow things down, but invariably it does to some degree as indexing is making a database of where files are and the 'content' to help make finding easier. It could be that Windows 7 took the 2 extra gigs of memory to change the performance model to make use of the extra resources to try and do just that, but not realizing it is creating a bit more overhead than usual.
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