If you haven’t done so already, please first try the trouble shooting options that appear in the ‘Attaching to…’ dialog after a mimote or so. Installing a hook helper can often resolve hooking issues without having to get to the bottom of the matter.
If that does not help, please check for potential hooking conflicts with other programs on your PC. That’s usually the reason for hooking problems. The trouble shooting guide on top of this sub-forum has more detailed information on the matter.