I found THE fix!!!!! I am running windows 8.1 but this will work for 8 and maybe even 7 as well..
There are 2 parts to this fix. Most people have already done part 1, but just to be sure follow these instructions completely...
First set the compatability of the game:
Open File Explorer (You can do this easily by right clicking the little window or Start on the bottom left of your screen and selecting File Explorer)
Click Windows_OS :C (C Drive)
Open Program Files (x86)
Open Origin Games Folder (not Origin)
Open Command & Conquer Tiberium Sun Folder (keep this window open for step two)
Scroll down until you find the Game (File Type Application)
Highlight game by single clicking on it, then right click to bring up the pop-up menu
Select Properties at the bottom of the pop-up menu
Select the Compatability tab in the Game Properties window
Check the box "Run this program in compatabilty mode for:"
Select Windows XP (Service Pack 2)
Also check the box below that says "Reduce Color Mode"
Then set the color mode to 16-bit color
Also check the box "Run this program as an admistrator"
Apply Settings and Then Click Okay
Half way there......
Next Download this file and then open the folder. I promise there is no malware or anything negative, just a few simple files. (Copy and paste if below link doesn't work)
http://tore.cnc-comm.com/TS_Win8fix.zip
Click to save the file and once it downloads open the folder, you should see the file Win8fix, open this and follow remaining instructions
Once again Open File Explorer
Click Windows_OS :C (C Drive)
Open Program Files (x86)
Open Origin Games Folder (not Origin)
Open Command & Conquer Tiberium Sun Folder
Now Simply drag the files from the download folder into the open Tiberium Sun Folder and launch the program as normal!!!!!!!!!!
I Hope this works for everyone as well as it did for me!!!!!!
*(Note: You may need to select a different compatabilty mode than Win XP Service pack 2)