Sounds like you've managed to make a mess of things, so your best option at this point is to just reformat before you get too settled.
That will take care of the two operating systems issue quite nicely. Then be sure to download the proper drivers for your sound card. There may not be any stock drivers included with Windows, so check over the various CDs that likely came with your system and see if you can't find them. Otherwise download them from the vendor's website.
i had to reinstall windows, then everything else, now my sound doesn't work. isn't there some sort of software to get my sound back. also is there any way to uninstall windows, beause now i have 2 windows operating systems on my hard disk and only need one.

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