If you plan on upgrading to Windows 10 from XP or Vista, you will need to perform a clean install as there will be no upgrade path for these older platforms according to Microsoft.
NewerTech Wireless Aluminum Keypad Review
NewerTech Wireless Aluminum Keypad
Office 2016 launching this year, touch apps coming soon
Microsoft reveals the next version of Windows 10
Introducing Windows 10 for phones
Hands on with HoloLens
Download: Windows 10 build 9926
The latest data for desktop usage share shows that Windows 8 has gained during the last month while XP has lost nearly one percent, but Windows 7 still remains dominant.
VirtualXP will convert a Windows XP machine to a Virtual HD image (VHD) that can be loaded and run on Windows operating systems, such as Windows 8, 7, 2008, and 2012.