[dudeabar]

There have been some issue with new .dlls in the 4.09 patch for some people.
What often fixes it, is, after installing the 4.08m patch, copy and save these two file:

mg_snd.dll
mg_snd_sse.dll

Then, after installing the 4.09m patch, replace the new files with the ones saved from 4.08m.

Say thanks to Bulau.