F12 and Ctrl+F5 not working correctly
You have a keyboard with an F-Lock key. The function lock is currently on. "Open file" and "Print" are the meanings of F5 and F12 when function lock is on.
So just turn it off.
Further reading
- Microsoft Corporation (2011).
Q894513 - Resolve unexpected Function (F1 - F12) or other special key behavior. Microsoft KnowledgeBase.