Did you happen to run a Registry Cleaner recently? Reason I ask is someone in here discovered that his reg cleaner had deleted a couple of items from the registry that were neeeded for Hoster. He restored those items and everything was working again.
If that isn't it then check this link. They have a regcure routine to correct this error.
http://simple-pc-help.com/support/ru...FQopIgodMTN6rg