Is the operating system XP or Vista?
Are you logged in as an administrator?
If it is XP go to this link and make sure you have done all the steps:
http://www.mtu.com/upgrades/hoster/xp-changes.htm
If it is Vista then go to this link:
http://www.mtu.com/upgrades/hoster/v...de-hoster4.htm
After you do that do the Remove and Re-install Hoster. Be sure to check the box on the personal information page to clear the registry entries as it installs.