There might be another program running in the background that is usin
this shortcut.
Or try to define it by yourself in Word:
Open the menu "Tools", choose "customize", press the "keyboard" button
choose on the left "Format", choose on the right "Bold", click insid
the "press new shortcut key" text field, and press Ctrl+B. now pres
"Assign", then "close", and again "close".
______________
'Microsoft Office Guide' (
http://www.free-training-tutorial.com