Failed to install Lync in Windows 8

When tried to install Lync in Windows 8 I faced error Another Installation Already in Progress (Although I didn't run previous installation). After some investigation I discovered I need to call setup as administrator.

But in Windows 8, right-clicking on a program in the Start screen won’t display Run as administrator option. While Run as administrator option is available when you right-click on a program shortcut on the desktop, the same option doesn’t appear when you right-click on program shortcut in the Start screen.

Step 1: Switch to the Metro Start screen and start typing the program’s name to see your program

Step 2: Right-click on the program name to see Advanced option.
Step 3: Click on Advanced and then select Run as administrator option.
After these steps, I can install Lync

Installing Multiple Instances of Windows Service

To Installing Multiple Instances of Windows Service.

• Install InstallUtil.exe.
• Add a /name parameter to specify what the service will be named. The names have to be unique, so if you already have "Telligent Mail Gateway", you might need to name it "Telligent Mail Gateway - Site 2".
• Specify the filename of the Windows Service, which is usually like "....Service.exe”. With Mail Gateway.
  
  it would be like this:
  InstallUtil /name="Telligent Mail Gateway - Site 2" Service.Service.exe
  
  Run this from a command prompt within the add-ons directory. The name must be in quotes if it contains spaces and must come before the filename.

How to Uninstall:

Uninstalling the service is very similiar to installing. You will still use the InstallUtil.exe program and will need to specify the name of the service to uninstall, though this time you will need to add a /u switch to specify that you intend to uninstall it. For instance:

InstallUtil /u /name="Telligent Mail Gateway - Site 2" Service.Service.exe

The name must be specified since if you have multiple instances of the same executable installed, it will need to know which one. If no name is specified, it will remove the one with the default name as opposed to a custom named one.

Again, the uninstall and name parameters must come before the filename so that it know they are for that file.