In the link i posted earlier projectRelentless posted how to install the BootCamp 5 drivers that I would try before going through the mess of re-installing.
Just disregard the disk switching etc as the post was written basically about getting non-suported Macs to be able to install Windows 8.
Since you already have Windows 8 installed the run as administrator option should work.
From projectRelentless post...
Upon finishing, lets go back to the USB/Burnt Disc where all your support software was saved, and lets get the newly support BootCamp 5.0.5033 opened up.
Big Thanks to a post by ErikVanD i seen on this forum for the next step.
If you want, try and click setup in this latest BootCamp support set, and you will get another sad error claiming x64 is not supported, something awful to that nature. Awww man, this far, only to get let down. Nope. We are going to fix that. And this is where ErikVanD's post pointed me to what we do next.
It was said to navigate in the BootCamp 5.0.5033 folder to something of the effect of BootCamp/Drivers/Apple and run the MSI file "BootCamp" (MSI file will say Windows Installer in its description, and not necessarily MSI for anyone not too savy with Windows) **note - NOT .bootcamp (notice the period in the front) and it should work and install the new Windows 8 support for your MBP...but in my case it didn't, which is why im posting how i fixed this. Your setup may somehow be different, but mine gave me an error say it "needs elevated permissions to run, use setup.exe instead. We tried that remember! And it gave us the x64 not supported error. Oh man! Blabbing aside, this file needs to be ran as an administrator, which yeah your the only user, but Windows is funny like that. Normally youd just right click, and select run as administrator, but out the box, that option isnt there when you right click, only install, repair, open with etc. Here's the next trick, you need to add a registry file to enable running as an administrator, dont be afraid, this is an old trick, and really easy.
Open notepad in Windows, and create a new doc, call it Add_MSI_run_as_administrator.reg
Paste this following code into the new doc
Windows Registry Editor Version 5.00
HKEY_CLASSES_ROOT\Msi.Package\Shell\runas] "HasLUAShield"="" [HKEY_CLASSES_ROOT\Msi.Package\shell\runas\Command] @=hex(2):22,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,\ 00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,6d,00,\ 73,00,69,00,65,00,78,00,65,00,63,00,2e,00,65,00,78,00,65,00,22,00,20,00,2f,\ 00,69,00,20,00,22,00,25,00,31,00,22,00,20,00,25,00,2a,00,00,00
Or download the file already made from my company server at
http://www.theprojectdev.com/public/pub.html **i put this there as a courtesy to help others like me, its just a complete reg file, so either create your own through copy and pasting above or download it. Either way, put it on your desktop.
Now double click the new registry file, and allow/ok it to do its thing.
Once done, you can discard the file from your desktop, or keep, your choice.
Guess What!? Now we can do the impossible! Lets revisit that solution from before by going to the newest BootCamp 5.0.5033, and navigate to BootCamp/drivers/Apple and select that tricky BootCamp MSI file that wouldnt allow us to run, this time RIGHT CLICK it. Because of our new registry entry we placed, we now have an option to "Run as Administrator" Click that option.
WooHoo! We have done what coudnt be done, BootCamp will now walk you through the installer, and add all the great support for Windows 8 on your mid 09 Macbook Pro that they for some reason neglected!
After the update, you will endure yet another restart. From there, most likely using a wired mouse still, navigate to the system tray icon on the bottom right corner of the screen (little up arrow) and click it. It will pop up a little menu, showing system processes/stuff running, click the gray squared diamond (this is bootcamp) and it will bring up the newest BootCamp control panel. From here, you can nav to trackpad/touchpad and set tap to click (finally) and gestures, etc. This control panel has lots of good stuff to make a MBP user feel comfortable in Windows 8. There you go! You did it!
I really, sincerely hope this helps someone, as it really made my day to get this resolved. I want to add that all On Screen Displays will work (your volume/brightness etc) they keyboard backlighting, and so much more, it really works great. I upgraded my hard drive to 1tb, and installed 8gb of PNY RAM from best buy ($40) and it runs Windows 8, AND OSX fantastically.
My company
http://www.theprojectdev.com designs and develops mobile apps (iOS and Android) and web design and development, so im a heavy user of both OS's, and this setup is just the best thing that has happened to me in a portable sense. Runs so so so fast! Enjoy everyone!
Try this "RUN AS ADMINISTRATOR" trick and let us know if it works for you.
