Welcome to the forums Shayner,
Since your Sony is a MiniDV and has the ability to
transfer via Firewire, are you using that method to get your video onto your PC? If so there should be no difference since it is just a mere copy/paste type transfer. Do not use the USB, it can not maintain a fast data-flow, and is primarily used to transfer still images. Firewire (Sony's iLink) is intended for transferring video.
You might want to read through
From Camcorder to DVD tutorial. Also read through the manual for VS, and it should provide you with some fundamentals on setting Capture Properties. It seems that you may not have the correct capture properties or your project settings are wrong.
With a video clip in the timeline or library, right-click on the clip and post the properties back here. Then go to File>Project Properties, and post them back also.