AV issue

ciao guys!
this morning I turned on my computer and in the summary screen CIS says that one threat has been detected, but when I click on the “1” number, it opens the antivirus events window and it is empty. it says “There are no items to show”. I tried to open directly the “view antivirus events” window with the same result.
am I the only one with this problem? I have Vista 32 bit.
thank you and keep up the good work! (:HUG)