Download the UltraVNC server (x64 version).

Run the UltraVNC installer and click through the setup windows.  Make sure you choose the option to install as a service.

If this is the first time you're installing UltraVNC, you may be prompted to enter a default password automatically at the end of the installation.

If you do not see this message, you will have to manually launch UltraVNC to enter a password. If the UltraVNC eye icon appears in your taskbar, right-click it and select Admin Properties.

If the UltraVNC eye icon does not appear in your taskbar, from the Start Menu click All Programs > UltraVNC > UltraVNC Server.

Enter a secure password in the Primary password box that is 8 characters or less. Make a note of your password as you will need it when setting up iTeleport on your iPhone in Step 3.3. Leave this window open and continue to the next step.

Related: Choosing a secure password

Uncheck the Remove desktop wallpaper option. 

Your Admin Properties page should look like this: