When i attempt to open Mozilla Firefox, i get this Alert!

"Could not initialise the application's security component. The most probable cause is problems with files in your browser's profile directory. Please check that this directory has no read/write restrictions and your hard drive is not full or close to full. It is recommended that you exit the browser and fix the problem. If you continue to use this browser session, you might see incorrect browser behaviour when accessing security features."

And

Yahoo Mail Login Alert

"An error occurred during a connection to login.yahoo.com:443.

Can't connect securely because the SSL protocol has been disabled.

(Error code: ssl_error_ssl_disabled)"

I have Vista Home Basic.

Could someone help me and explain, in simple terms, what i need to do?

Thanks :)