Error when installing vSphere Client on Windows Server 2008 R2

Hello,
Can I get any idea from someone? I am using: vsphere client, Windows Server 2008 r2 and I have found the following error when attempt to login to vsphere client on my Windows Server 2008 R2.
"Error Parsing the server "x.x.x.x" "clients.xml" file Login will continue contact your system administrator".
Thanks.
