I have Windows 8.1 , but I could not install the desktop e-mark software. What I have to do?

If you have Windows 8.1 and you cannnot install the Desktop e-mark Software, disabling the diver signature on Windows 8.1 may help.
 
Unlike previous versions of the Windows operating system, Windows 8 imposes strict limitations on driver signing. Because of this, unsigned drivers require extra steps for installation. 
You will need to restart your computer several times throughout the course of these instructions. We recommend you print them before you begin, or use a separate computer to follow along.
 
What to do:  
1- Hold down the Windows key on your keyboard and press the letter C to open the Charm menu, then click the gear icon (Settings).
 
 
2- Click More PC Settings.
 
 
3- Click General.
 
4- Under Advanced Startup, click Restart Now.
 
 
NOTE: In Windows 8.1, the 'Restart Now' button has moved to 'PC Setting -> Update & Recovery -> Recovery.'
 
5- After restarting, click Troubleshoot.
 
 
6- Click Advanced Options.
 
 
7- Click Windows Startup Settings.