I would put the TV further away from the sceen. That close COULD possibly be close enough to have the TV affect the Computer, and I imagine that it affects the TV. If you get reception/antenna instead of cable/satellite, you might even be able to see some of the effects on your reception.
However, my guess if the monitor isn't bad, is that it's your refresh rate. Some monitors have a refresh rate of 75, though most would be fine with 60...
Go to your device manager and look under either the monitor or video cards/display adapter to look at the refresh rate. Before you do that however, look to see if a manual came with your monitor, and check to see there what the refresh rate for the monitor is. You don't want to screw it up on purpose afterall!