I have had this in other programmes, so I uninstalled it, restarted the computer, and then re-installed it and it's worked fine ever since. The software in my case was for an Epson v500 scanner
A common fix for PSE problems is to reset the preferences :
Note: Deleting the preferences file is an action that cannot be undone.
Press and hold Alt+Control+Shift (Mac: Option+Command+Shift) immediately after Photoshop Elements begins launching.
Click Yes to delete the Adobe Photoshop Elements settings file.
A new preferences file is created the next time you start Photoshop Elements Editor.