I was getting an install error while trying to install WM 11 on my Windows 7 64bit machine and I found a fix action and thought I would share.
Here is the error from event viewer:
Activation context generation failed for "C:\PROGRA~2\Yahoo!\MESSEN~1\YCPFoundation.dll". Dependent Assembly Microsoft.VC80.CRT,processorArchitecture="x86",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="8.0.50727.5592" could not be found. Please use sxstrace.exe for detailed diagnosis.
Here is the pop up error:
"The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log for more detail"
Here is the fix:
1 - Uninstall Yahoo messenger
2 - Install the Microsoft Visual C++ packager FOR WINDOWS 7