Nuttin'?
Wasn't ther a highly professional video editing package made free a couple years ago? Anyone remember that?
Define "sharpening" more precisely. Do you have static? Lines?
If you really mean sharpening, there are a number of AviSynth filters that will do that. Here's a couple that generally look good:
http://avisynth.org/vcmohan/SegmentedAmp/SegmentedAmp.html
http://neuron2.net/msharpen/msharpen.html
There's Cinelerra. It's a professional package, but GNU/Linux only. I don't do video editing, so I have no experience or comment, but if it's something valuable enough to consider, a thumb drive install of GNU/Linux would be a viable way of using it.
http://heroinewarrior.com/cinelerra.php
(C) 2012 Unemployed, flat broke Programmers
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Lightworks might be able to do something for you. They have a paid version, and a reduced function free version. I'm just DuckDuckGoing around because the question interested me.
http://www.lwks.com/
Edit:
and Avidemux
http://avidemux.sourceforge.net/