Inkscape gives runtime error (no number but its below)

I get this error when I try to save .dxf files in Inkscape:

Fatal Python error: Py_Initialize: can't initialize sys standard streams

Then it seems to recover but it doesn't really recover. It saves the files and then DraftSite won't open them. Here is what the thing says when it tried to fix the problem.

File "D:\Program Files (x86)\Inkscape\python\Lib\encodings\__init__.py", line 123
raise CodecRegistryError,\
^
SyntaxError: invalid syntax

Here are my computer specs:

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Ultimate, Service Pack 1, 64 bit
Processor: AMD FX(tm)-6100 Six-Core Processor, AMD64 Family 21 Model 1 Stepping 2
Processor Count: 6
RAM: 16330 Mb
Graphics Card: NVIDIA GeForce GTX 560, 1024 Mb
Hard Drives: C: Total - 239806 MB, Free - 39808 MB; D: Total - 61553 MB, Free - 46085 MB; F: Total - 1907726 MB, Free - 1461558 MB;
Motherboard: ASUSTeK COMPUTER INC., M5A97
Antivirus: avast! Internet Security, Updated and Enabled


All of this is so I can take any file type, convert it to bitmap with Inkscape, run a trace, convert it to .dfx and send it to a plasma cam, but sometimes I will need to send them to DraftSite for further manipulation. I think everything will work if I can resolve the saving problem.

I am open to hear any suggestions on how to do this more efficiently. All this is to get it to a plasma cutter.