If you have the retail virsion of Win7 it
should have an option when you format your hard drive and reinstall. To install either the x86 or x64 packages you want to select the x64 one. If it doesn't you'll have to "buy" the x64 one. Could always try
Torrents Search Engine but be careful what you download.
When it says "Useable 3GB" it means you're only using 2Gigs of RAM (a third of it) and your GPU RAM (If it's distributed logically, if not it could be as little as 512mb on the GPU).
You'll have to wipe your primary HDD to reinstall the OS. See the other topic on this section on how to do that or PM me.
If you want to upgrade from 7200RPM to 10,000RPM drives you'd have to buy a Raptor drive from a shop and swap them over. Buy two and you can RAID them up, it's pretty easy and would be much faster for load times on games.
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