Hi Guys
It's my first time on this forum and I hope I can help this situation a little. I use an M-audio 2496 and it's one of the best investments in my home recording studio. The minimum requirements, as stated on the box for a PC is as follows; Win 98SE, ME, 2000(SP4), XP (SP1), DirectX 9.0b or higher. For 48 khz operation; Pentium II 450 Mhz w/ 64MB RAM - For 96kHz operation; Pentium III 500 Mhz w/128 MB Ram. For proper recording though I suggest a minimum of 512 MB. Remember these are minimum Requirements.
Now to record something, depending on what you are doing, instruments, vocals, MIDI Keyboard etc. you will need the proper hook ups. If you get a Condenser Mic, highly recommended, then you will need Phantom Power. I use a Behringer UB-802 Eurorack Mixer for this. It works good except with the M-Audio you don't have a monitoring plug and that has to be worked out in other ways so you may want to go to a more expensive Mixer with Effects and proper Recording Monitor, as well. The UB-802 has a monitor but not while listening to the previous sound track during recording. You will need software to record to. I use Cakewalk 2002 which works well although I think the New Sonar would be better.
Depending on your reasons for recording I would be sure and get a decent Mic, above the $150.00 USD range. I bought both my M-Audio and Eurorack on eBay but I reccomend purchasing a Mic locally unless you know a specific one you want and you find a good deal on the net.
You will also need connecting hardware, cables that is, to connect your mixer, mic etc. to the computer. Your mixer will take RCA connections the same as the M-Audio. One important thing, if you are going to have many instruments plugging in at the same time you may need to get the next step up in Sound Cards from M-Audio to allow you more inputs. The 2496 only has 2, left and right, RCA inputs and 2 S/PDIF in/outs as well as a MIDI input and output.
The thing I like about the 2496 is that it gives you a very Clean Input Sound which makes for great recordings.
Hope this helps.