MS Excel not responding

Hi:

I installed Avast AV Free yesterday.

Noticed that under “Expert Settings”, the box “Scan Programs when Executing” was checked. But whenever I go into excel for the first time, it just hangs and does not open. When I click on the “X” to close XP explorer, it says that the program is not responding.

Why is that happening? Should I uncheck that box?

Thanks.

mdubin

Is there any addon in the Excel? Which is the Office version? 2003, 2007 or 2010?