I have a new MacBook Pro 13-inch mid-2010 model, and I noticed that when I am in Windows 7 and try to use my headphones through the audio jack, I get no sound. I looked on Apple's website, found the 3.1.3 patch which claims will fix headphone sound, downloaded it, but when I went to install it, I got this error: "The upgrade patch cannot be installed by the Windows Installer service because the program to be upgraded may be missing, or the upgrade patch may update a different version of the program. Verify that the program to be upgraded exists on your computer and that you have the correct upgrade patch." This is frustrating because I DO have Boot Camp 3.1.0 installed, which I assume is the version needed to upgrade, and Boot Camp IS installed. I also downloaded the 32-bit version as that is the version of Windows 7 I have, and just for jollies I tried the 64-bit version but that yielded the same error. What am I doing wrong here? How can I install this patch? I would very much like to be able to have functional headphones. Thanks in advance!