1. Did you restart the computer after installation? If not, do so.
2. Reinstall Hoster if you restarted as instructed at the end of the Installation. Something went wrong with the installation.
3. If #1 and #2 above don't fix the problem, download hoster2125setup again and install it.
What you are experiencing appears to be an installation problem to this oft humbled mind.
FYI: We expect to start testing Hoster 2.126 today. There are no new features. The Installation by Floppy Disc fails in 2.125, so we fixed it. It should be available to you tomorrow for download by clicking your download link if you purchased Hoster21UpG for any of the 2.12x versions.