Make sure your PC meets the minimum requirements for this setup. I personally don't know anything about "Dazzle" per se, but I think it has been around awhile, so it should be good for what you want to do, which I assume would be to edit home movies or VHS and put it on DVD/CD.
If you have a DV (Digital Video) camera, you can skip the Dazzle hardware, and use your DV camera as a "digital bridge" which will convert you analog tapes in to a digital signal which you can edit and burn, or copy back to tape. All you would need then is editing software.