Can you legally make a copy of windows 7 for home use?

The short answer is - no. Windows 7 software is protected by copyright. If you make a copy (even of the disk that came with your own computer) you're breaking the law. Each copy of Windows 7 software is licenced for ONE machine only. The first time you use Windows 7 - it registers with their server, activating the licence key for that copy. If you subsequently install it on a second machine - the Windows server instantly knows the licence key for that copy has ALREADY been activated.