Hi Sophie. I'm Greg, an installation specialist, 10 year Windows MVP, and Volunteer Moderator here to help you.
You can try another browser. I would have several browsers on your task bar so there's always one that's best for the task. I use Firefox, Edge and Chrome in that order of preference. It's easy to share bookmarks between all of them in their settings under Import Favorites from another Browser, and Firefox and Chrome let you sign in to save and/or sync your Favorites on any other device you sign into. Set the preferred browser as Default in Settings > Apps > Default Apps.
Next try resetting your browser:
https://www.howtogeek.com/171924/how-to-reset-y...
For new Edge reset in Edge Settings > Reset Settings.
Run this Flash tool in all browsers to make sure it's enabled properly and latest:
https://helpx.adobe.com/flash-player.html
For Edge follow these extra steps:
https://www.digitalcitizen.life/how-unblock-fla...
If you use Edge and nothing else works then I'll give you everything that works to fix Edge so at least something will work:
Back up your Favorites first in Edge Hub (three dots top right of browser) > Favorites > Manage Favorites > Export to file. If you can't reach Edge you can install the tiny app Manage Edge Favorites here:
http://www.emmet-gray.com/Articles/EdgeManage.html to do this, which also gives Edge all of the Favorites Management enjoyed in Internet Explorer.
You can reset new Edge in Edge Settings > Reset Settings, or for old Edge in Settings > Apps > Apps and Features, scroll down to Microsoft Edge, highlight it, choose Advanced Options, then Repair, or if that fails, Reset.
If that doesn't help then try re-registering the app following Option Two here:
http://www.tenforums.com/tutorials/3175-apps-re...
New Edge is available for download here:
https://www.microsoft.com/en-us/edge and will replace the old one. To run both see here:
https://www.tenforums.com/tutorials/144061-enab...
I would have several browsers on your task bar so there's always one that's best for the task. I use Firefox, Edge and Chrome in that order of preference. It's easy to share bookmarks between all of them in their settings under Import Favorites from another Browser, and Firefox and Chrome let you sign in to save and/or sync your Favorites on any other device you sign into. Set the preferred browser as Default in Settings > Apps > Default Apps.
If nothing else helps then run a Repair Install by installing the Media Creation Tool and choosing from it to Upgrade Now. This will also bring it up to the latest version 1909 which you need anyway by the most stable method.
http://windows.microsoft.com/en-us/windows-10/m...
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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