For any that are afraid to upgrade, this might be of interest to you.
This is from the Microsoft Forum and it is about setting up a Dual Boot system so you can Keep your old, what you have now and have the new Windows 10 on your machine at the same time.
Welcome to Microsoft Community. Your interest in Windows 10 Technical Preview is much appreciated.
You can dual boot Windows 10 with the previous versions of Windows. Refer to the below Wiki article by one of our MVP
Andre Da Costa on
How to dual boot the latest Windows build with previous versions of Windows and check if that helps:
http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-dual-boot-the-latest-windows-build-with/9695dfc7-1c13-4d8d-b10b-587e78c6ac36
Windows 10 is designed to be compatible with the vast majority of Windows 7 and Windows 8.1 devices, so your device is most likely compatible.
For details on your specific device and apps, you can use the Get Windows 10 app to do a compatibility check. Click the menu in the upper left of the app, and select "Check your PC" or "Your PC is good to go." This displays any compatibility issues we find and recommends a resolution; while we don't have info on every app or device in existence, it provides a comprehensive list of all known potential compatibility issues.
Some Windows 10 features will require advanced hardware and not all features and services are available on every device, nor in every market. For instance, Cortana is not available in all markets.
Keep us posted if you face any issues on windows in future. We will be glad to help you.
Edit / Add / Important to posted above !
I want to dual boot instead of replace my current version of Windows.
If you need to install Windows 10 on a separate hard disk or partition, you will need to purchase a full license.
Retail pricing information:
Edition Pricing
Windows 10 Home US $119
Windows 10 Pro US $199
Windows 10 Pro Pack US $99