Generate CSR for code or driver signing certificate

We have created an EXE file for distribution to our customers but virus software blocks the install in many cases due to 'unknown source'. We need to create a signing certificate to submit to Windows store for approval. We have done many of the steps but get stuck at step #4 (Click Active Directory Enrollment Policy) in this link [login to view URL] Because this certification has to happen on our computer the notepad file we would need to connect remotely so your expertise can get us past this step.