Hi,
I can recommend you good freeware products for deinterlacing and denoising, easy and helpful to use even for professionals.

Alparysoft Video Quality Controller --works in realtime with Windows Media player and other players
http://www.alparysoft.com/prod/quality-controller.php

see also Alparysoft Cleaner for Amateur Video - you can clean your video before watching it on PC or plazma TVs
http://www.alparysoft.com/prod/video-cleaner.php

Your comments are welcome