yeah... while it is possible to use a lappy to run Sonar or MC.... the factory card is not the best way to do it.
I noticed the A-500 has midi input/outputs as well as the USB port....
See if you can find a low priced audio interface with midi input/output on it.... it will make a huge difference. Trying to do midi on a factory card usually results in serious latency/delay issues. An interface solves those problems and lets you record and mix it in real time. Playing in real time is also possible.
Seriously, once you get the inputs set up properly, it's a simple matter to turn it on and it's ready to record.
The folks in the MC forum can help get you set up correctly so it works.
My Dell lap top has never been able to get me sound out of the factory card. I have always had to use my interface. I also can see the meters moving on input but never have I been able to hear it.
An interface to get it going will cost between $100 to $250 depending on the features. You might find a gently used one on ebay or craigs list from someone upgrading. The interface is the heart of the system so don't cut yourself short in this area. Get a good one the first time.
USB based running ASIO drivers. The inputs and outputs that you need. MC can run 2 inputs at a time so the lower priced interfaces with 2 channels are fine for it. Ask questions if you are not sure.
NOTE: While I now use Sonar X1, I used MC4 for many years. It is perfectly fine for recording.....and if I read it correctly, you already have it. Just get a nice interface and you're all set. With a USB based A-500, all you need is an audio interface.... it will make a big difference once you connect it.