Which operating system is easiest to install?

Windows 10 is easiest OS to install.

Currently every OS is easy to install. In case of Microsoft, after win 98 & 2000, You can easily install OS graphically. You can manage you hard drive graphically and no need to fire any command. Personally I refer to Win7.

I fully agree with the answers been added by EXPERTS................Thanks.

Windows 7, Actually Microsoft's all O.S

Base on my experience WINDOWS Operating system is the easiest to install

Satisfied with Amar Sawang Answer...All Microsoft Windows Products (After win 98,200, & me). You need to know just startup BIOS options about Boot Devices. Then Boot your disk and follow the instruction (Graphically). In windows 10 there is a update option. 

I think Windows (7,8,8.1) is the easiest one.

All Microsoft OS , Linux Ubuntu 

Every OS has its advantages, be it Windows or Linux. Windows maintains its legacy of user friendliness and hence Its very easy even during its installation as well. Self explanatory that even novice person can also install it.

Every OS having GUI based installation environment is easy to install.

Windows is easiest way to install.

A suggestion:

If you want to make your Operating System Fast, you can install SSD Hard Drive and setup as a primary, after that you can install any operating system, it will not take time.

Follow the below Link to check about SSD vs HDD:

https://www.youtube.com/watch?v=jeEjP-RL4&ab_channel=ASUSNorthAmerica