If you have recently bought a new PC you probably have Windows 8. Windows 8 is the latest version of the Windows Operating System from Microsoft. It has not been a very good release for Microsoft financially as the adoption rate for the new OS is pretty low compared to other Windows versions. The Windows 8 User Interface is different from the previous versions of windows.
The goal of the Windows 8 user interface was to create one unified interface that works on both tablets and desktops. Most people will find the user interface more confusing on a desktop. The big changes in the user interface are: (1) The PC starts with a window containing a bunch of tiles (2) If you launch the Windows desktop the start button is gone but otherwise looks like windows 7.
Luckily there a few solutions to make Windows 8 more like the older version of windows. There is an open-source classic shell that looks just like the old windows you know and love. If you want the start button back give me a call and I can help you fix it.
Of course, there is a rumor that Microsoft will be bringing back the start button in a future Windows 8.1 release.
Windows 8 User Interface