Yes definitely DISM should be run before attempting to reinstall Edge using their method. I would try uninstalling Edge by using the method in this link ([URL] Then reinstalling it through the Windows store. (I just copy and pasted my previous reply)
Not sure if this is the right place for an Edge problem.   I started my laptop a few days ago only to find most of my Edge favourites had gone. Soon after that Edge closed down and will now only start for 2 or 3 seconds before closing itself so no chance to clean the cache or disable extensions. I've done a system restore, though surprised I only had one option from a week ago even though I do them regularly, but the restore didn't help. I’ve run the DELL support app plus Windows Defender plus Total AV plus Malewarebytes but no changeAfter Googling I tried the sfc /scannow thing but no help. I’ve tried modify/repair Microsoft Edge but no difference.   Using Windows 10. Any ideas?
Microsoft Edge