Fix ALT+TAB in Windows 8.1

Hi to all, my first post in this blog
I've Windows 8.1 and the keys combination ALT+TAB doesn't work properly.
This combination actives the function to switch from one window to another.
The problem is that this function remains active for a very short time and I'm not able to select the window I want to see.
I tried a restart in safe mode and the function works properly!
I think the problem is a Windows service because the situation repeats identically with a clean install of the system(no driver or applications installed).
Please help me!

Are you holding ALT button while pushing Tab ?

Ahahah...Sure! I know how to use a PC

Thank you Edwin! I created the shortcut but I get the same effect: the flip 2D appears for a very short time.
I used the shortcut both pinned on the taskbar and on the desktop but nothing changes!