Edit: Here is another reason to go back to your original OS. Look how yahoo uses the relevance to bury my answer. They are doing their best to hide the cons of Windows 10. That in itself speaks volumes.
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Yes you should.
Back up everything important and then try clicking Start, Settings, Update & security, Recovery, Go back to (last version)
If that does not work it will depend on if M$ erase your recovery partition. It is my opinion that M$ deletes the recovery partition to keep people from going back to their old OS. I guess if you write as many bad OSes as they do you got to find a way to make it look like everyone likes it. Keep in mind if the recovery partition is there and you use it then all data will be lost. You should back up anything you want to keep.
Keep in mind if the recovery partition is there and you use it then all data will be lost. You should back up anything you want to keep.
Try recovery from the recovery partition
When you press the power button start tapping the F key for your puter and the BIOS menu will open. Select recovery from the menu, answer the question and the recovery should begin. Depending on your puter this will take one to two hours.
Manufacturers BIOS menu F key
HP/Compaq ESC
ASUS Del
Sony F2
Samsung F4
Gateway, eMachines F10
Acer, Dell, Fijitsu, Gigabyte, Toshiba F12
Your BIOS menu should look something like this. Yours might be different. I am posting this to give you an idea of what it looks like.
ESC = BIOS menu
F1 = System Info
F2 = System Diagnostic
F9 = Boot Device options
F10 = BIOS Setup
Why you should.
I would wait until they decide that it is a mistake and release another version. Oh wait, I'm sorry, they are not going to do that anymore. They have decided that you are stuck with this one. It is called Windows as a service. What that really means is that M$ can install anything it wants on your puter anytime it wants. Their attitude is, tough we now control you and your puters and there is nothing you can do about it.
I would not upgrade to Windows 10. It is spyware masquerading as an OS.
Spyware is software that aims to gather information about a person or organization without their knowledge and that may send such information to another entity without the consumer's consent, or that asserts control over a computer without the consumer's knowledge. Spyware is mostly classified into four types: system monitors, trojans, adware, and tracking cookies. Spyware is mostly used for the purposes of tracking and storing Internet users' movements on the Web and serving up pop-up ads to Internet users.
By default it logs just about everything you do.
http://boingboing.net/2015/08/03/windows-10-defaults-to-keylogg.html
http://www.zdnet.com/article/windows-10-silently-uses-your-bandwidth-to-send-updates-to-others/
http://bgr.com/2015/07/31/windows-10-upgrade-spying-how-to-opt-out/
They say you can opt out of it but it still phones home, it's a trap
http://www.extremetech.com/computing/212160-windows-10-still-phones-home-even-when-ordered-not-to-do-so
Then there is the matter of not being able to turn off auto updates or selecting what they install. In other words with Windows 10 M$ can install anything they want on your puter.
http://www.pcworld.com/article/2949621/windows/windows-10-will-force-automatic-updates-for-all-home-users.html
Causing it to churn through data, blowing up usage caps
www.zdnet.com/article/windows-10-churning-through-bandwidth-blowing-data-caps/
They have a bad track record with updates, but now it will get worse.
http://www.zdnet.com/article/windows-10-cumulative-update-causes-reboot-loop-havoc-for-some-users/
http://www.zdnet.com/microsoft-pulls-updates-recommends-uninstall-7000032678/
http://www.zdnet.com/article/has-microsoft-stopped-testing-their-updates/
I saved the worse for last. The other reason for forcing updates on you is to also force new releases of the OS on you. They call it Windows as a service. This means the next time they have a Vista or Windows 8 you will not have a choice to update to it. They will use your auto update feature to force it down your throat. Everone knows the history of M$ and how bad they can be in detroying a good OS.
http://theconversation.com/the-pc-reaches-its-twilight-years-as-windows-10-becomes-the-last-major-upgrade-32411
http://www.itbusiness.ca/news/windows-10-review-the-last-os-youll-ever-have-to-install/58355
It is a sad state when a population rolls over to major corporation, which shares what they have with the government when requested, and allows everything they do be monitored, logged, stored, and saved for ever.
Just pick up a history book and see how well this has worked out in the past. Back then they couldn't come close to how much data is being collected today. Think Germany, Russia, China, Cuba and oh so many more who have fallen prey to Totalitarian, Fascism, Communism, Socialism, Nazism, or any other ism you can think of. Give up privacy give up liberty and freedom.
If you do decide to update make a complete image of your hard drive in case you decide to go back to your original OS. We are finding using the go back feature built into Widows install is causing problem and M$ is deleting the recovery partition.