Display - 800 x 600, 256 colors (Minimum); 1024 x 768 high color, 32-bit (Recommended)
Memory - 1 GB (Minimum); 2 GB (Recommended) -- Memory is cheap these days, so I recommend getting as much as you can. 32 Bit OS's can't take more than 3 gigs of RAM.
Processor - 1 GHz Pentium processor or equivalent (Minimum); 2 GHz Pentium processor or equivalent (Recommended) You shouldn't need a multi-core processor. Just make sure you aren't running too many programs at once during testing.
Graphics Card - 32 MB's (Minimum); 256 MB's (Recommended).