Please, answer first these questions:
What version of Windows are you on? Is it 32-bit or 64-bit?
Go to Windows Start and in the Search box type winver.exe and then press Enter.
What is the version of Internet Explorer installed on your computer?
In Internet Explorer go to Help -> About Internet Explorer.
P.S. Please, don’t say that you are not using Internet Explorer. This is irrelevant. Skype depends on Internet Explorer.