|You didn't happen to install SKYPE recently?|
There have been a few reports of problems.
Try doing a Repair.
Not sure how Word 10 is configured,
so use the Control Panel,
Programs and Features,
select Word 10 (if that is all you have installed,)
do not double click, just select it,
at the top of the window, on the task bar,
you should see an option for "Change"
select Change and do a repair.