you can't, however, all is not lost.
you can use RtvReco to automatically close the warning as soon as it appears. this nifty little tool is designed to automate many aspects of Windows, by pressing buttons in annoying dialog boxes, choosing menu items, maximising, and minimising windows for you.
... or use a decent file mananger instead of Windows Explorer (e.g. Total Commander).
both programs are shareware, try before you buy.
i am aware of this registry hack, however, it does not work for me with Windows 7
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
set the value of
ConsentPromptBehaviorAdmin to zero (0)
and Reboot.
p.s.: of course there are free alternatives to Total Commander, it just so happens to be my file manager of choice.