Microsoft just launched Windows 10 which is the best OS from Microsoft according to them. The Public version will almost take 2015 to reach but here is the way you can enjoy the latest version of Windows before it reaches out to public.
Here are few things you need to know about Windows 10 :
I advise not to install it on your primary computer or laptop because it might have some of bugs(so called problems in simple language).Better to use VMware or Virtual Box to install and taste the new flavors from Microsoft.
Firstly you need to download the ISO file of the OS. I can provide you with my ISO which i got from Microsoft, but why not get your own licensed ISO when Microsoft provides it for free.
1) Goto Windows 10 Technical Preview.
2) Click on "Get Started" and then "Join now" to join Insider Program.
3) Click Install Technical Preview.
4) Scroll down and select the file according to your location and use.
5) Let the file be downloaded and saved somewhere and now here is the video to help installing Windows 10 in Vmware. The same procedure is for virtual box.