I have a late 2011 MacBook Pro, OS X Yosemite 10.10.2. I installed Windows 7 (64-bit) via Boot Camp and it worked fine, the problem now is that the drivers I downloaded (5.1.5621) will not install. It says to check the bit-version or whatever, x86 or x64. Then I tried to troubleshoot the BootCamp.msi file in Drivers/Apple but this happens... (see attachment). Thanks for the help.