This is a simple tip to run multiple Skype account on your window PC. This will help you to run multiple instance of Skype at same time.
Step 1. Go to your Program file and look for Skype folder inside Skype folder open Phone folder eg: C:\Program Files\Skype\Phone
Step 2. Find Skype.exe and right click on it and create its shortcut on desktop.
Step 3. Now right click on created shortcut on desktop, click on properties after click look for target and add /secondary at end of path with leading space as shown in image bellow.
Step 4. Done! now when ever u double click on shortcut icon it will launch new instance of Skype.