As far as I know, all TV tuners (if using windows) record in wtv format using MPEG-2 and a different tuner will not change that. The problem seems to be your software doesn't like the format. Try converting your wtv files to dvr-ms. You can do this by right-clicking on the recorded wtv file and select "Convert to DVR-MS". Some older software like dvr-ms but don't like wtv.
I use a old version of Win TV from hauppauge I like it because with the software that came with the card I can record on my computer then use different supplyed software to burn to DVD then watch on my normal TV.using a standard DVD player. Microsoft's Software does not play nice with converting and using elseware.