Hi Guys, I have completely lost access to Gmail and all Google accounts via Firefox - error message "secure connection failed Error code: sec_error_bad_der

I have been a long time Firefox user and this is the first time I am truly baffled. Now if I try to log into gmail or any google account on my main PC I just get an error message as below.
Secure Connection Failed
An error occurred during a connection to accounts.google.com. security library: improperly formatted DER-encoded message. (Error code: sec_error_bad_der)
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the website owners to inform them of this problem.
I have tried reinstalling, clearing cache, clearing cookies, and just about every other thing I can think of but to no avail. I can access through IE and also via firefox on my other PCs but no joy on my main PC. Please help as this one is stumping me.
Many thanks for your help.

Sorry I forgot to add my system is Win 7 64 home premium

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