I ask because I have NEVER run across it. I have run across a similar message that states "Host process for windows services stopped working and was closed". If that is the actual message you see then you might check the following link which guides you through several potential fixes.
If none of those solve your problem try re-installing the Windows Update Agent -
For the past month and a half, I have been unable to check for windows update, and a message comes up every 20 minutes or so and says "Windows host server has stopped working". I have ran Advanced system care, ad-aware, AVG, and malwarebytes anti-malware, but nothing comes up. no proxies, i can browse. Windows Vista 32-bit. No error messages coming from the windows update, just a red X where the shield is. I'm open to suggestions, sorry if this is vague.