After Anniversary Update Word 2010 docs do not open

[Aris]

After the (unwanted) Anniversary Update was pushed onto my Dell laptop, all my Word 2010 docs have changed their icon to Office 365. When I try to open them with Word 2010, there's a message that says "Office is not installed." I tried to open them with LibreOffice that recognizes Word docs, but a similar message appears. I have a ton of work to do and I don't know how to do it. And of course I do not/do not wish to enroll in Office 365 (because I do not need it). If you have any ideas, please help!!!