Go to Start | All Programs | Accessories, then right-click on “Command Prompt”, and select “Run as administrator”.
This will open a command prompt window with admin rights.
Navigate to the directory where you saved the apache*.msi install file, and type “msiexec /i apache*.msi”
(where apache*.msi is the actual name of the file - hint: type apache and then hit tab, it should fill in the file name automatically). Hit enter, and the rest should work just fine, it did for me. Hope this helps.