The sudden cpu increase could be windows houskeeping (dumping buffers and swap files at same time) try defragging disc, turn off delayed write to the disk and turn off pagefile. I have same camera and use PD9, it captures fine. But i am on a desktop with SATA III (6 mb/s, 64MB cache) drives. If you have an external USB drive (turn off indexing service), try downloading DV to that.