If you want to use pre-built Hyper-V Agent Installer then you can download from jenkins.
For master you can download from http://jenkins.buildacloud.org/job/cloudstack-master-hyperv-agent and for other releases search for appropriate job at http://jenkins.buildacloud.org/ .
To build on windows you have to follow instructions of step 1 at https://cwiki.apache.org/confluence/display/CLOUDSTACK/Setting+up+a+CloudStack+dev+environment+on+Windows.
...
Note: Apart from installing service you have to manually create and add ssl certificate. For that you can follow the steps here https://cwiki.apache.org/confluence/display/CLOUDSTACK/Manually+Creating+and+installing+self+signed+certificate+for+CloudStack+Management+Server+communication+with+Hyper-V+agent
...