I've had it running for so long, forgot what's required :-) however it could be needing a Windows runtime library or something.
Try installing the C++ redistributable package:
http://www.microsoft.com/en-us/downl...s.aspx?id=5555
For testing AVISynth you could open an .avs file with Virtualdub
http://www.virtualdub.org/download.html or even a windows binary of ffplay part of a Windows ffmpeg install available here,
http://ffmpeg.zeranoe.com/builds/ as long as it was compiled with avs support.
Or you can process .avs scripts with Avs2yuv
http://akuvian.org/src/avisynth/avs2yuv/ and Avs2pipemod
http://forum.doom9.org/showthread.php?t=160383&page=6 on the CLI serving to Windows binaries of x264
http://x264.nl/ or ffmpeg etc, both avs2yuv & avs2pipemod also allow possibility of 10 & 16bit data out of Avisynth to x264 10bit build and Imagemagick 16bit image formats,
http://forum.doom9.org/showthread.ph...59#post1386559, but one step at a time. :-)