A MIDI to USB cable (where the midi part is plugged into the keyboard) should work with your computer, regardless of manufacturer. Most MIDI-USB cables have an actual converter box in them, you will just need to install the proper drivers. If there is a problem, it isn't Acer's fault- if anything it'd be a Windows driver/BIOS problem.
But at any rate- I'd second the Axiom. It's a little more expensive per key than a lot of midi controllers, but it's built very well and has a nice Semi-weighted feel to it. If you can, I'd go with at least 61 keys in a controller if it will be your main keyboard. Right now I'm working off of a 49 key Axiom and I find myself having to do all sorts of tricks just to be able to play in parts. Just keep in mind that you will get what you pay for; so going for the cheapest think possible isn't the greatest idea.
Check ebay for a used upper-end controller (like the Axiom, or the Novation X-Station). That way you'll keep the price down, but still get a quality 'board.