What has Microsoft done? I can't access my docs without paying them. Help!

I went to do some work this morning and surprise! Microsoft has replaced my MS apps (Office 2008) with some version that I don't want not have to pay for the privilege of using their software. Talk about Ransomeware!! Even if I try to revert to my previous version, I can't do it because the "Restore previous purchase" just spins around and around with no end. I tried activating the one month trial until I could figure out what to do, and I get a message that my Apple ID and password for iTunes is incorrect. Funny, I just signed into the forum with the same one I've always used. Why is it now incorrect in some places and not in others? And what the heck is a "Microsoft Certificate" that I have a password for that I've never seen. I thought the login password was the same as the system password. Can anyone help me?