Trying to use Emacs in MS Windows (operating system), which I acknowledge is not ideal. However, whenever I attempt to use the Meta key the tiled start menu appears serves as a disruption and makes Emacs unusable. Is there a way of either disabling this feature or re-assigning the key?
emacs -Q (no init file), the Meta key should work normally on MS Windows - no problem.
However, I think what you are referring to is the fact that Windows grabs certain
Alt (hence Meta) keys for its own use, so that Emacs never sees them.
There is an Emacs function,
w32-register-hot-key, that you can use, to take care of this - you just "register" whatever key bindings you like as being for Emacs, not Windows.
For example, this makes Windows pass
M-S-tab to Emacs:
(when (fboundp 'w32-register-hot-key) (w32-register-hot-key [M-tab]) (w32-register-hot-key [M-S-tab]))
However, for 64-bit Windows 7 at least, this option no longer has any effect.
This is unusual behavior. Normally the Windows key brings up the start menu, and Alt on its own does nothing. Nevertheless, if you find you need to rebind your keys, you can do so using the free program SharpKeys. Using registry keys it can rebind any key on your keyboard.
You may just want to figure out what program is causing the Alt key to behave this way.