THE SAME THING HAPPENED TO ME!!!
The blue ribbon popup has been appearing for months...I have ALWAYS declined. Then, just yesterday, when it appeared again, it gave me NO option to decline...just to install now, install in a few hours, or install later. I clicked on later. The popup appeared again this afternoon, and only gave me the now/and a few hour options. I contacted HP Tech Support in a panic, to see if they could do something to stop the update which would automatically take place in a few hours. They were no help at all, telling me that they would FIX everything. After a few hours, guess what....I NOW HAVE 8.1. INSTALLED ON MY PC. I NEVER, NEVER WANTED IT AND NOW I'M STUCK WITH IT!!! THANKS SO MUCH MS OR **** UP MY PC!!
This is inexcusable..and before you tell me I must have accidentally allowed the upgrade, I can assure you that I NEVER did. The popup both yesterday and today gave me NO option to say NO!!