Hi!
Probably something went wrong in the registration process. You could try to uninstall and reinstall CadTools or register the component manually.
To register manually
Type in the following (or copy and paste) in the small window above your start button (search programs and files) and then press ENTER.
regsvr32.exe C:\Windows\SysWOW64\mscomct2.ocx
You should get a small dialog box telling you that the registration succeeded.
Regards
Lars