Vista - Sound with sb audigy

windows xp - fully updated
Soundblaster audigy card updated driver (but same problem with previous
driver)

Problem:-
When using sound (clicking the telphone icon)
The remote user either doesn't receive notification that an attempt has been
made to use a voice call or the remote user's messenger falls over or my
messenger reports in the messenger window "messenger unavailable.
[No other problems experienced with sound card - eg Skype works fine]

Tried:
a. Windows update of sound blaster driver [ this was not straight forward.
Could not automatically find KsUser.dll (had to navigate to it, version
found was 2004 then same issue with errCantRemember.sys] BUT then reported
installation successful]

b. Settings > Control Panel > add/remove > Windows Live Messenger > Repair

No go - still have the problem

--
Jim Bunton