Even after you only click it once the "capture" window does not pop up? Are all your cords connected properly?
When you get Roxio open, go to task manager, then right click Roxio, clock "Go to processes", then right click and choose "End Process Tree" if there are any hidden applications linked to Roxio they should all be terminated. Also this is slightly "canned" but run as administrator and make sure Roxio is allowed in your firewalls.
That is pretty much the ONLY solution I can think of for your problem. It thinks you have multiple apps running, so if you only click it once just be patient and let it load, mine can take quite some time "15-20 seconds" to load if my laptop isn't quite fired up and running smooth.
If your problem persists, who you gonna call? Roxio support that's who.... I ain't afraid of no posts.