Still facing the issue? Have you tried updating to 13.1? Did you try restarting the computer? Does it happen with every project or just this one project?
Also, what model of camcorder is your video coming from and what format and resolution is it?
Are you using photos and, if so, have you ensured that these photos are no larger than 2000x1500 pixels in size (at 72 ppi)?
What are the specs of this "brand new" computer? Which processor do you have and how much RAM? How much free space is on your hard drive and when did you last run Disc Cleanup and Disk Defragment on your drive?
This thread that we are in now represents a duplicate of a thread where the discussion is already in progress and is waiting for follow up from you in order to continue to resolve the issue.
Moderators typically close the duplicate and point the user to the original thread. So, I would suggest that you continue in the original thread already in progress.
But, progress with depend on the details that you supply to us to help you. Looking forward to helping you work through this problem.