[Hector Melendez] “First, I can’t preview the timeline thru my video card.”
Without more details I’m not sure how you expect us to help you with this.
[Hector Melendez] “Second, I’m not able to export a still frame.”
This is well documented.
[Hector Melendez] “I tried to import the footage into CC3”
The message you quote is about importing a project file, not importing footage. You cannot import newer version project files into older versions of Premiere Pro.
Cheers
Eddie