Sounds like your motherboard uses the VIA chipset. However, you never
mentioned the actual motherboard (or the brand and model of your
computer). Have you called whomever makes your computer to find out
where is their web site to get downloads for drivers and utilities? For
example, if it is an Dell then you go to Dell's site (because you may
never be sure what exact motherboard they decided to use the week they
slapped together your unit). If you know the motherboard was made by
Asus then you go to their web site. You might find something at
http://www.viaarena.com/ but you would be working at the chipset level
so you would need to know what chipset you actually have. If the
utilities don't tell you, and you can't figure it out by looking inside,
then talk to whomever sold you the computer to find out what is inside.
To get better (and correct) info on your system, you could run
msinfo32.exe. However, Belarc Advisor (free) would probably be easier
to understand. Everest Home is a utility to report all sorts of stuff
about your system but is a crippled version of Aida32 (which included
reporting the software license keys) but you might be hard pressed to
find a download for Aida32 anymore.
Plays through a different "browser"? That's not just another instance
of IE? If so, it is likely that it plays using Windows Media Player as
the client-server to render the music data stream, so go into Windows
Media Player to see if adjusting its equalizer causes whatever effect
you want.