Question: Excel 2013 often complains that "We couldn't free up space on the clipboard. Another program might be using it right now" when I'm trying to copy cells. 

Some [say](http://answers.microsoft.com/en-us/office/forum/office_2013_release-excel/we-couldnt-free-up-space-on-the-clipboard-another/93ffe338-d07a-4e2d-bc07-49806f811dca) it might be caused by Zone Alarm or Bing Desktop. I have none of them. I'm running Windows 7, so I don't have [clipbrd.exe](https://superuser.com/q/531984/116475). How can I know which is the other program Excel is complaining about?

![enter image description here](https://i.stack.imgur.com/cyPAF.png)

Answer: 
This also happens if any other program is monitoring the clipboard. For example, I had free download manager and it was monitoring the clipboard. When I switched this option off, the problem went away in Excel 2013.

And I do not have bing desktop nor do I have zone alarm.
This is an old question but I thought I'd post my experiences with it so it may help others.

I am also having this error but I finally figured it out. I went through the task manager and started to kill all process and testing drag/drop. Once I killed the Dropbox process, the error went away. So it seems if you have Dropbox running, it messes with the clipboard. 

This helped me so maybe it will help someone else. I'm not sure if there's a newer version of the Dropbox windows 8 app that doesnt cause this error. but for now I'm just not going to run Dropbox.

I ended up having to uninstall it for the issue to go away.

EDIT: Seems the issue is back. This is getting real frustrating....