Question about memory usage in vista 64 bit

Hello, just getting set for Bioshock here in the next few days and I just reinstalled vista 64bit. I noticed it's using about half (if not more of my 2gb of ram) i've been reading the some posts about it and it doesn't look like shutting off superfetching is much help. So i'm just curious from a gaming viewpoint if I need to be worried much? When I launch a power hungry game like bioshock am I going to have to worry about memory issues/framerate drops?

Thanks.

*Intel Core 2 Duo E6600 Conroe 2.4GHz 4M shared L2 Cache LGA 775
*ARCTIC COOLING Freezer 7 Pro (cpu fan)/Artic Silver Themal Paste
*ASUS P5B Deluxe/WiFi-AP LGA 775 Intel P965 Express
*Kingston HyperX 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) -timing: 4-4-4-12 -voltage: 2.0v -cas latency: 4
*COOLMAX CW-650T EPS12V 650W Aluminum ATX v2.01
*BFG 8800GFX 756 MB OC video card
*Antec 900 Gaming Case

ah ok, thanks. won't sweat it then.

This also give some issues as if you run more applications at same time and switch from one to another for while and then switch back, you will get realy bad performance and high disk ussage as it start reading all data from swap back to ram and it doesnt matter if other application dont need resources used by other one.
This is what realy bugs me as for example when i swith from EQ2 to desktop to read som web or watch some video whitch dont require much ram, and after some minutes switch back, game is unusable for some time whitch can reach 2min+ in some cases. (2GB ram)

I would not call this very efficient, its just oposite.

Vista can flush its RAM cache very quickly, and I don't see the desktop/video/web as being particularly demanding, so chances are there is either a problem with the game or the video card driver. The video card should switch memory from the game to Aero and back smoothly, so you should check to see if the video card drops back to 2D mode when alt-tabbed (as it should) and try running the game without Aero enabled and test alt-tab. You could also try increasing EQ's priority in the task manager to see if that helps it regain focus more quickly.