I need help with my tv, Panasonic TH-42PWD8UK producing very fuzzy pictures.?

I know almost nothing about Televisions so i have no clue where to begin fixing this issue. The picture seems to be fine when I've got the cable plugged in, but when I plug in my Xbox 360, it's terrible. Literally terrible, not even remotely near being decent. Since there's not any place for a video input that would run to my Xbox, I got an adapter that lets me plug the video output into it, and then connects to the television with an S video chord. I have to use that same chord to connect my cable to the television though, and the picture from that is fine, but whenever I plug the Xbox up, it's too fuzzy to even read anything on there. Please help?
I dont know where to begin looking for help on this issue btw, so if you dont know how to resolve it, I would greatly appreciate being pointed in the right direction.
 
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