I too installed the IDT codec through Win. update and was not able to go back using system restore. I had to reinstall the original drivers that was preinstalled from gateway and now all works well. I did see that after installing the original drivers that came with my laptop Windows update immediately let me install Vista Sp1 which I was unable to do before. I installed sp1 and everything is fine. I am having no issues whatsoever. The audio updates that had been installed previously was holding me back from installing sp1.
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