Running WIN7 x64 here on a desktop w/8GB RAM. No problems with games so far. Even DosBox works and allows me to play my 2 old DOS games. Dragon Age: Origins runs without a hiccup, so I'm sure NWN2 would run...on a desktop.
Laptops need to be bought with as hefty a graphics processor you can afford, because you can't "upgrade" the video card,,, because there isn't one. A laptop with lots of RAM and a hi-end GP is quite expensive in the states...usually over $1000 US, and maybe even over $2000 US.
That being said, it is "possible" to buy laptops that have replaceable GPU's so that the GPU can be upgraded in the future. But why wait for that? Just get what you need when you first buy it.
But since it's for work, I'm guessing your employer will foot the bill
