Win XP maybe the last MS OS I will buy... 
Microsoft may provide security related updates to the OS Components that will be automatically downloaded onto your computer. 
Potential holes with auto-download is that, some unsavoury types may duplicate MS’s auto download protocols/authentication process, and install rouge programs. 
These security related updates may disable your ability to copy and/or play Secure Content and use other software on your computer. 
So much for running legacy programs, business may look else where…