Tv as primary monitor - only showing some of screen!

I've searched the internet for a while about this and nothing, maybe my keywording ability sucks... anyway, I'm trying to use my RCA entertainment series a my primary display, I've got an BFG Gforce 7950 512 w/ s-video out that im using. It's the s-video with adapter that changes into component (blue, green, red) that i've got plugged into my tv. I got it to work the first time, no problem, just went right through properties/settings and chose it as the primary. It's max resolution is 1024x768, that's what I had it as, full screen and all.
Now, me being picky and whatnot I decided to mess around with my Nvidia control panel to see if i could get a better picture, and I screwed something up. I can no longer, no matter what resolution I have, or setting like 480i or 480p, get the tv to display the entire desktop. It only shows a section of it, I can't see all the icons on my desktop or even the taskbar. It's seems zoomed in. I have no idea what I did so, I really need some help.