http://support.apple.com/kb/HT1899 first item.
If you have additional Bootcamp questions you should post in the Bootcamp forum where the Bootcamp gurus hang out. https://discussions.apple.com/community/windows_software/boot_camp
The update to boot camp is now available!
Just installed Windows 8.1 Pro to my MacBook Pro, Retina, Mid 2012, OS X 10.8.5: Memory 16GB 1600MHz DDR3
After going through the usual process from boot camp, then installed windows and the support drivers... the trackpad rt click did not work. I had to then go download the boot camp again from windows 8 using the url below and ran the set up.exe from the boot camp folder you can download from below. Run it within windows 8.
Boot Camp Support Software 5.0.5033
This solved the Trackpad Right Clicking issue (not working) as well as tapping.
The wireless and network connectivity issues where resolved as well. The Boot camp support software enabled a boot camp control panel available in the windows 8 system tray and from there you can enable the track pad to tap and use the secondary click.