As Windows 8.1 has adopted a flatter interface, gradients and drop shadows have been removed from a variety of places including the mouse pointer. If you feel that the mouse pointer drop shadow helps make it easier to spot on the Desktop, do the following:
1. Access the "Mouse" Control Panel. One way to do this is by pressing Windows + R, entering main.cpl and pressing Enter.
1. Access the "Mouse" Control Panel. One way to do this is by pressing Windows + R, entering main.cpl and pressing Enter.
Accessing the Windows 8 "Mouse" Control Panel
2. When the "Mouse Properties" multi-tabbed dialog box appears, click the "Pointers" tab.
3. Near the bottom of the dialog box, check "Enable pointer shadow".
Enabling the mouse pointer shadow in Windows 8.1
4. Click "OK" to close the dialog box.
This tip was written for Windows 8.1 running on a keyboard / mouse interface.
source from http://malektips.com/