As everyone has said, dropped frames is most likely that your PC can’t keep up with moving the data from the tape to the hard-disk over the Firewire port.
Stop all unnecessary programs. Capture to a separate hard disk drive so O/S overhead won’t interfere with the capture. Use a 7200 RPM hard disk drive. Finally, when I was capturing DV (I am 100% tapeless now), I used Scenalyzer to capture my footage. It’s very light on system resources and all it does is capture DV.
