Glad you got it working then somehow... It probably was something to do with the realtek audio driver after all. Maybe Windows 7 has found a better driver. You will need to decide for yourself whether everything sounds okay. It probably will. Enjoy IE9 but if you are curious then try the other web browsers also.
I cannot install the IE9 on my computer.  I click to install and it goes all the way through and then at the end it says something about some files are still being used by the internet, click on restart to finsih installation.  So I click on restart and when my computer restarts before everything loads up it says preparing to configure windows updates, do not shut off your computer.  I watch it and it goes all the way up to 35% but then says it's unable to configure windows update and then reverts back.  I have closed all applications like my antivirus and spy sweeper and don't see anything else open before I do this and still cannot get this to install.  Anyone have any ideas as to why I can't or what can I do to get it to install?  Is IE9 ready yet or is it still in its BETA stage.  I have a Dell Inspirion 530S with windows 7 home edition installed.  Thanks for any suggestions.  
IE9