I am having an issue when watching a movie on my PC and computer monitor the sound is synched, but once I drag it over to my TV to watch, the audio lags and is not synched up. any ideas?

You really need to make sure you PC is putting out the native rez of the display to minimize this. A digital connection running the native rez should have no lag at all in theory.

native res of the TV? i have a panasonic 42PX80U which I believe the native res is 1280x720. I have a DVI to HDMI cable hooking my computer to my TV...