Skype: The installer has insufficient privileges

Hi,
The Skype installed on my system auto updated itself. However,the update has failed yielding the error shown below.
I am the only one who uses the computer, and I definitely have admin privileges.
I have tried downloading the latest version of Skype but unfortunately it gives the same error.

The installer has insufficient privileged to access the directory:
C:ProgramDataMicrosoftWindowsStart MenuProgramsSkype. The installation cannot continue. Log on as administrator or contact your system administrator.
Please help me!
