Using Windows on Mac keyboard without Delete key
Solution 1:
When you press the Fn key, the backspace key (Mis-labeled "Delete") on a mac keyboard functions as the delete key.
Therefore, to log onto a windows install which requires Ctrl+Alt+Delete, you would press Ctrl+Alt+Fn+Backspace("Delete").
It's worth noting that this works even on the full wired keyboard, with a separate delete key.