New PC (4 mo old) running Win7.
I keep the calc on my desktop throughout the day and just recently (last week or so) it stops working almost immediately after I start it. I have to go through the task manager to end it. Any other programs running at the same time are are not affected (Office 2010, a text expander, and Express Scribe), as well as Avast, MSN IM, Live Mail, and a couple gadgets in the background.
Last thing installed was Office 2010 a month ago and then that incessant Adobe update today.