High Pitched Sound

Hi all,
I am getting some sound issues in RailWorks, where the sound is played faster, which makes it sound higher pitched this effects every sound that RailWorks plays. I did not have these issues before I formatted my Hard-Drive and reinstalled everything. This in turn points to a software issue, but at this point I am stuck. I do not know which software/drivers, are the ones that I need, and I don't know where to find them. The only thing I can tell (so far) is that my computer uses Sigma Tel Audio. And my driver(s) for sound are probably very outdated. I'm running Windows XP SP3 and would appreciate any help.
I am getting some sound issues in RailWorks, where the sound is played faster, which makes it sound higher pitched this effects every sound that RailWorks plays. I did not have these issues before I formatted my Hard-Drive and reinstalled everything. This in turn points to a software issue, but at this point I am stuck. I do not know which software/drivers, are the ones that I need, and I don't know where to find them. The only thing I can tell (so far) is that my computer uses Sigma Tel Audio. And my driver(s) for sound are probably very outdated. I'm running Windows XP SP3 and would appreciate any help.