keylight not working properly in ae cs6 trial

• after effects cs6 trial v11.0.2.
• windows 8.
• I dont know codes and stuff. i have windows 8..thats all i know. i have another camera but i havent tried keylight on it yet but my problem is with windows 8 right now
• no error messages

         following a video tutorial on how to chroma key

• was my first time chroma keying
• quicktime 7.7.3.
• nothing? just after effects
• no idea
• 4gb ram, x64 based processor, one disk drive.
• trapcode?
• no idea
• never even got to ram preview?
• Are you using Render Multiple Frames Simultaneously multiprocessing? i dont know what that is
• i was following a video tutorial: go to key light 1.2, use the eyedropper, click on the color, it becomes a blackish blue; i want white