Reinstall it using instructions in:
http://counterpartyd-build.readthedocs.org/en/latest/BuildingFromSource.html#on-windows
(reinstall everything including python, git etc..., then
cd C:\
git clone https://github.com/xnova/counterpartyd_build
cd counterpartyd_build
C:\Python32\python.exe setup.py)

If still an issue, then post in the tech support thread:
https://forums.counterparty.co/index.php/topic,22.0/topicseen.html