I have a problem when I install Windows Live Messenger, the error msg is:

"The installer has insufficient privileges to access this directory:
C:\Program Files\MSN Messenger. The installation cannot continue. Log on as
administrator or contact your system administrator."

I am the administrator and I have tried to create the folder my self, then I
get this error msg:

"An error occurred while attemting to create the directory: C:\Program
Files\MSN Messenger

I have also changed to ownership of directory Program Files but it doesnt work

Anyone got an idea?