I'm not even going to pretend I read the thread fully but:
Was that from XP to Vista cus Vista handles memory differently (it caches [programs?] memory or something similar so programs load quicker.)
64bit is beneficial but I've had loads of driver problems on "supported" 64bit hardware on xp and vista, however this may have been to bad installs.
Effort wise? You will have to re-install the OS, then transfer any data you want to the new install. I cannot comment about the game profiles, sorry.
It's "unbelievable" that an OS actually uses the resources available to it, rather than allowing them to sit there useless?
What's unbelievable is that "computer guys" still evaluate an OS's efficacy this way in 2008. Unused RAM is utterly useless. It is not a mark of efficacy.
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