exactly. blame is the trustet platform module from microsoft which is now installed in almost every new computer.
if internet is available microsoft can read your data and lock your computer as they like. if you use win10 you are no longer master of your system, you have only the right to use with limitations and your system is leased at ms.
in germany, there are the "chaos computer club" and "re: publica" which has published a few shocking articles about the collection behavior and the deprivation of the user by microsoft.
i go so far to not use EFI because it not only makes problems with other operating systems, but because it creates a direct connection between the operating system and bios, which I consider to be one of the biggest security risks there is. in the past you could enter your bios only by keyboard input and the settings were not changeable from the outside. Now you can get on a virus directly into the bios and even leave data there ... but that's another topic ^ ^
yes, microwurst tries as well as apple to get your data and tell you what you are allowed to do and what not. ms seems a little friendlier, but they are not.
why are all using win10? because it's cool, new and easy. But it is not, it just looks like that.
your problem might have to do with the user account control and probably comes from having a preinstalled system on your computer.
I personally only use XP, win7 and linux. I have a win10 computer but only for compatibility reasons.
Although there are many other opinions, I personally do not believe in the increased security at win10. Personally, I see microsofts behavior as an attack on freedom.
I would advise to win7 but you will find 10000 opinions explaining why win10 is better and why you can not use 7.
by the way: meanwhile you have no more problems with viruses but with the update system of ms which makes your computer just as unusable.
I do not care if my system is not usable because someone has invaded there or because someone has made an official update ^ ^
you can create a multiboot system. It's pretty easy with win7.
you install win7 on a formatted hard drive with two partitions and after that you just install ubuntu on the other. It is important to install ubuntu as the last one because otherwise you will get problems with the bootloader and your computer thinks that one of the two installations is not there. You can get that manually, but it's harder ...
a win7 installation is pretty easy. you just need to have a dvd, a usb-stick or a network installation of win7 and start the computer with it. then you come into a few menus where you can set language, network and time zones.
the rest actually goes by itself. if you've never done that, it's worth getting someone to help you or watching a few videos.
if all goes well win7 is installed in one hour. if there are problems, it can cost you a whole day and a lot of nerves.