Mavericks - Windows7 bootcamp speakers issues

I have a 13" mid 2009 macbook pro recently upgraded to mavericks and after that, I partitioned my hard drive with bootcamp and installed windows 7. All good so far but my speakers don't work when I'm in windows. Device manager says everything is working fine and it doesn't think there are head phones plugged in or anything (which I've seen has been a problem for some people.) I tried to re-install the drivers on the windows disk as suggested but I get the "bootcamp x64 is unsupported on this computer model" error. I tried a couple of things from past posts but I either got that all the drivers were installed and up to date or I got kinda stuck and couldn't follow the suggested instructions because I don't have any real coding skills (I've only ever written code in SAS for research purposes.) Also my bootcamp folder that I downloaded doesn't have a bootcamp64.msi file, only a bootcamp.msi file. Again, I am having no other problems with windows so far. It's just the lack of sound. Any insight would be greatly appreciated. If you're insight requires coding please be SUPER specific about what needs to be typed in the command prompt. Thanks!

I used bootcamp 5.0.533, though I'm told there is a bootcamp 5.1.0. Don't know if that could be making a difference.