Well, not to plug a product, but you really should have bought a Sound Blaster soundcard, cheap no-name cards can be a nightmare waiting to happen.
On BIOS setup, when you first boot your machine, there is a 'setup' program that can be accessed, usually by hitting a certain key. Next time you boot up, watch very carefully for a message like 'Hit DEL to enter setup'. It goes by very fast, though, you must watch for it. If you hit the key it says while the message is there, you will enter the BIOS setup program. You should go through every page of that, and if you find any entries to disable your onboard sound, do so, it's critical that you do so since you have an add on soundcard as well.
Once you've disabled the onboard sound, see if that solves your problem. If it doesn't, let us know, we'll see what the next step is.
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