I know this has been asked but I don't see any answers, just comments on the form of the question or responses that don't seem to speak my language.
I unintentionally (yes, I meant to use that word) installed Windows 10 on a HP desktop. Since then I can't open web pages, can't print my calendar, some programs don't work while others only function on a part time basis and many other glitches that prevent me from doing my work.
After the install I saw a message that said the old files would remain for 30 days then be deleted. I presumed that meant I could switch back. I can't continue to function without a computer.

Windows.oldfolder that has the files from the previous OS is deleted after 30 days of using Windows 10. Just a small tidbit about being able to rollback to the previous version. – DrZoo Aug 31 '15 at 19:28