I just started having this issue a few days ago and have done A LOT of research and tried many things to try to fix it. I finally found instructions in Microsoft forums to get IE back on my computer that worked! I have posted instruction below, and I hope it helps others who are having this same aggravating problem!
If IE is missing completely, try this.
Click on Start then Settings. Go to Apps | Apps and Features. If you don't see Internet Explorer, click on Manage Optional Features then Add A Feature. You should be able to add or enable it. Restart your computer when done so it takes effect.
