[i cannot cut and paste in events. and an my computer freezes when i do]

i cab no longer cut and paste into events.  when i try, my system freezes.  i can however, manually enter the information.  in both cases, an error notation appears in the lower left hand side of my screen

[when i try to cut and paste to events, my computer locks up. there is an error message]

when i attempt to cut and paste to events, my computer locks up.  an error message of sorts appears in the lower left hand corner of the screen.  i can manually enter events without problem, but the error message appears wben i do.