Editing Windows shortcut keys may help you, if it is possible.
From the XP help: "With the cursor in the Shortcut key box, select the keyboard key you want to use in combination with CTRL+ALT. Shortcut keys automatically start with CTRL+ALT. The Shortcut key box will display None until you select the key and then the box will display Ctrl+Alt+the key you selected. You cannot use the ESC, ENTER, TAB, SPACEBAR, PRINT SCREEN, SHIFT, or BACKSPACE keys. " We're not interested in Ctrl-Alt here, so I don't think that this would work.