You and I had the same tv, and I had the same thing happen when its not on just scan. Also, I havent used Nvidia for a while, but ATI has a slider to adjust for scan issues but keeps the res the same.
MPC -
http://mpc-hc.sourceforge.net/
AVISynth -
http://www.free-codecs.com/download/avisynth.htm
FFD Show -
http://www.free-codecs.com/download/ffdshow.htm
Haali Media Splitter -
http://www.free-codecs.com/download/...a_Splitter.htm
I use dvd fab platinum to rip, pm me if you want a link for that one.