Bob has been trying to digitize his old VHS home movies and he's getting some jitter. Leo says that it could be that his computer isn't powerful enough, but it could also be the device he's using to capture the video. External USB 2 devices aren't as fast, especially for higher quality video. And it'll compress it greatly.
The bottom line is that he needs a faster USB 3 device to handle the workload. He can get an internal card for it. If his computer already has a USB 3 port, or even Thunderbolt, that would be better. He should upgrade his device to USB 3 and he'll be good to go. Hauppauge is a good place to start, as is Pinnacle/Grass Valley.