Windows Live Movie Maker 2011 (build for me is 15.4.3538.0513) -I use Win 7 Ultimate
Open it, drag fraps avi file to WLMM, click top left icon (save options, opening stuff, etc...), save movie... now go to "Create Custom Setting".
Setting: 1024x768 Fraps
Name: Fraps Convert
Video Settings
Width: 1024
Height: 768
Bit Rate: 6000 to 18000
Frame Rate: 30
Audio Settings
128 kbps, 48kHz, stereo [to] 256 kbps, 48kHz, stereo. [higher the kbps, the larger the file]
**Now save**
You can easily convert large Fraps AVI files to more manageable sizes. Above settings -with 128 kbps, 48kHz, stereo generate 43.83 MB per minute of video.