Photoshop Elements 11 menus don't open properly

Hi

I've used PSE11 successfully for some years but my programme is now not operating correctly. When I fire it up I get the blue opening dialog box but it no longer has the list of contributors names and just goes through the list of start-up activities. Once open, none of the drop down menus can be read. I just get a white vertical bar appearing with arrows in some of the rows but the menu options don't appear to the right of them. OK, so I try to reinstall the programme. First PSE11 is not shown in my list of apps in Windows 10 so I can't uninstall it. How odd. All my other apps are listed normally. OK, so I try to run the install disc which starts to uninstall PSE11 after I check the "Deactivate" box but after a few seconds stops telling me there is an empty file and it won't go further. I guess some file in PSE11 has become corrupt but I don't see how to proceed from here. Any ideas, please?