I'm not sure which OS you are using but you may need to re-register the dlls. When I do this I normally unregister them first (probably not necessary but I do it just for the sake of completeness.)
Click Start -> Run
Type regsvr32 -u Icwhelp.dll
Press [Enter]
Click Start -> Run
Type regsvr32 Icwhelp.dll
Press [Enter]
this unregisters then re-registers icwhelp.dll. Just do the same for tapi32.dll. You may not need to do this but if you do that is how
