Our clients were having all kinds of issues getting updates from our WSUS server. The service itself was only showing a few machines (out of circa 200) reporting in daily.
I uninstalled WSUS completely and deleted the folder it used to store content (parent of UpdateServicesPackages & WsusContent). I rebooted and reinstalled WSUS.
Now clients are reporting in thick and fast. However there is no content for them to download to update. I have read online I need to run wsusutil reset to download all the content again; but whenever I run the command from cmd prompt or PS I get errors indicating the command is incorrect?