Adobe Premeire 6.5

I was able to capture fine up untill a month ago. Then, I could capture up to 45 minutes, then it froze up on the capture screen, but kept going on the camcorder. I let it sit for about a week and then it allowed me to capture 50 minutes and then 20 minutes the next morning, but then it cruds out. I just installed a new capture card; could that be the problem? It could also be the capture card, of which I have no idea to find out what one I have. Any ideas? I need to do this within a week for a class project.