Restoring some folders on a new computer after hardware failure

I have Acronis True Image, Build 6525.

My problem:
I did a full backup of my PC. Shortly after that the mainboard died, and instead of having it repaired I decided to get a brand new computer.
The new computer has a lot of new components on board, so it was necessary to re-install Windows anyway. But I would like to get the files back which I had saved in my "documents" and "video" folders.
So I installed Acronis again on my new PC and attached the drive with the backup. But I can't find any options to restore anything. How can I point Acronis to the backup files that were done with my old machine?