You might be able to get a slight upscale with some sharpening. Don't worry about any denoise. Try just 2x DVD resolution on Lanscoz (parameter 2), and if that doesn't work, go down to 1.5x or so. If you can't do any resize, play around with the Sharpen filter some to see if you can get some more detail out of the picture (just don't over-sharpen).
One thing that I had to worry about was making sure my software plus Overlay renderer were outputting blacks and whites at the right level, in conjunction with having my display at the right output. I used www.displaycalibration.com
and the Phillips Pattern Generator (http://www.mooneyass.com/testpatterns/
) to make sure my TV's HTPC input was properly calibrated to my computer/video card's output. Then I used a test disc to make sure my DVDs were playing with the proper levels. I know that VMR might require some adjusting in FFDSHOW's Levels (Input settings). I boost the gamma on mine to 1.15, and boost the Levels Input to 5, to get more shadow detail and make sure my blacks are black after boosting gamma.
It can be pretty complicated. If you have the money ($200-300), an upscaling DVD player is another option, and does practically the same thing (no sharpening or user tweaks, though).