Ctrl + Alt + Del with a mac keyboard

Windows is designed so that, unless system security is already compromised in some other way, only the Winlogon process, a trusted system process, can receive notification of the C-A-D key combination

You could probably remap the keyboard , try ctrl alt fn-delete (the easiest potential solution) or simply turn off the need to use the three fingered salute to log on

You can try the Apple Wireless Keyboard Helper, it maps Mac keys combos to windows keypresses.

• F3: Printscreen
• F4: Task Manager
• F7 - F9: iTunes Control
• F10 - F12: System volume Control
• Eject: Toggles Fkeys/Functions
• Fn + F key: Triggers function (useful when in F keys mode)
• Fn + Backspace = Del

When using a Mac keyboard attached to a PC, the Mac keyboard key I use for the PC Del key is the fndelete ⌦ key combination.

This works with control and option (alt) to form a CtrlAltDel.

Using the Mac's delete, which is equivalent to the PC's Backspace, does not work for me. I don't need to use ⇧ with option (alt).