My new coputer (with the 16x9 screen and Vista) is the lap-top. (HP dv9000 series) the screen measures ~17 in.
My old one has a "normal" 4x3 moniter (Nokia Multigraph 447 ~16" set at 1024x768 res), I used to use a GEM flat-screen LCD of ~15 inches.
The game plays ok on my old computer, but it lacks the memory (both on-board the graphics card and RAM) to properly play many of the levels. It often hast to use virtual memory, which makes the game run impossibly slow. (it only has 512 MB of RAM, and dedicated graphics memory is down around 128, maybe less)
Compared to my laptop with as much graphics memory as my old computer's RAM. Along with 2GB of RAM.