An unhandled exception occurred. While connecting via VPN

Hi all,
I have my laptop with Windows 7 and connected to my office system which is Vista Business. Every time i connect, i get this box.
Error
An unhandled exception occurred. Please check your settings.
Parameter is not valid.
See the error log of the application or the application event log of the client for additional information.
OK
Not sure, why i have different windows opened on vista and not able to identify which window or software shows out this message.
Any help would be wonderful.
Regards,
Pappa.
