Buffer overflow in mcafee anti-virus

We have the same problem with our McAfee anti-virus, the "buffer overflow". Every few minutes, it pop-up a message box saying buffer overflow with some messages.
It is distracting in our work, if we close it, It will pop-up again.
What are we doing is drag it to the low side of our monitor to keep it hidden without closing it.
Do we need to replace our anti-virus?
What is a buffer overflow in McAfee?
