CouchDB does not officially support Windows. CouchDB intends to provide an official Windows installer at some point in the future, so this may change. At the time of going to print, the only unofficial binary installer is available from:
This is unofficial software, so please remember to exercise additional caution when downloading or installing this software, as it may damage your system. Imagine a fearsomely comprehensive disclaimer of author liability. Now fear, comprehensively.
We recommend you ask on the CouchDB mailing lists for further help.