Explorer Shortcut Keys Not Working

Have no mouse available due to other problem.

Using older OEM Microsoft Ergonomic (butterfly) keyboard 104 key. Has 2 "windows" keys and "mouse-menu" (ie right click) key adjacent to spacebar. All keys appear to work.

CAN activate explorer using CTRL-ESC, arrows, then ENTER on icon.

Window opens, can navigate with arrow keys.

CANNOT access menus with ALT-? (ie ALT-F, ALT-E) ==CRITICAL==

CANNOT change panes using TAB or SHIFT-TAB to move to address bar ==CRITICAL==

CAN use shortcut key CTRL-C, CTRL-X, CTRL-V (copy, cut, paste)

CAN use ALT-UPARROW to change to upper directory. Address bar path will follow. Can then use ARROW and ENTER to select drive.