Can you try to explain your situation in more detail? There are plenty of experienced and smart people here to help you, but it's hard with so little to go on.
What brand of TV?
What model? (at the very least, old tube style or newer flat panel)
When does it go fuzzy? (i.e. not with DVDs or games, but when watching TV?)
Do you use cable or an antenna?
How old is the TV?
Anything else that's funny about it.