Your JVC is a MiniDV camcorder, which uses a Firewire connection for capture. Firewire drivers are standard for all DV camcorders, and built-in on every version of Windows since about Windows 98SE (well, they didn't work very well until Windows 2000).
You still need a capture application to complete the transfer. Most (maybe all) versions of Windows comes with Windows Movie Maker, which is a very basic program, but it can do this.
Normally, a DV camcoder can't be detected by Windows until you have it connected via Firewire, and have it the appropriate mode. On some cameras, this can be play or record (the latter would tranfer live video, or allow recording TO the camera), on others, you need to set the camera to a "link to PC" mode. I currently own Sony and Canon camcorders that both work in the former way, but my first DV camcorder was a JVC, and it did have to put in a "link to PC" mode to be detected by the computer. If you can't find the setting, you might want to check your user manual.
For still photos, it looks like you use a USB connection. I haven't found all the details on this camcorder, but this is likely to be a normal USB "storage class" connection. If so, your camcorder would show up like a disc drive, and you can drag photos over. Vista will support this by default, too.
The other way some older camcorders send photos is to appear to the system as a USB scanner type device. You would need a device driver for this, from JVC.
The user manual would be helpful here. You can get one via download if you don't have it: http://books.jvcservice.com/booklist.asp?Model=GR-DVL310Uhttp://books.jvcservice.com/booklist.asp?Model=GR-DVL310UM