In order to fix the issue, go to Start, type cmd, right-click on the utility and select Run as Administrator. After that, type regsvr32 jscript.dll, press Enter, type regsvr32 jscript9.dll and press the Enter key again. Reboot your computer and try again to add contacts. If you still have problems, remove Skype from your computer, run a registry cleaner and download and install the latest version from the official web page.