Problem: When trying the "Request Software" link on the end user portal, you get the message "Unable to load portal ActiveX Control."
Resolution: Install the PortalClient.msi file located on the Installation media. When you install the media, you receive no notifications, but that is OK. It still worked. Try to request software again.
Most users will use the self-service portal to request software. Create a package in SCCM to deploy the package to all workstations so users never see this error.