hi, welcome to the forum!
if you tell us which game you're having problems with (probably Enderal?) we'll move your thread in the corresponding sub-forum
a general sizzling sounds like a hardware "issue". did you try to adjust the speaker's plug?
(assuming you connect the headphones to the speaker)
does sound outside of this game work?
if so, please let
Steam verify your game files.
(if you're playing Nehrim switch to Oblivion first!)
if it doesn't it might be something driver related, reinstalling those might work.
otherwise it could be an issue with the speakers
or even the soundchip (probably Realtek?).