Even tho FF and Opera both are seperate from IE, what ever settings are in IE reflect on both FF and Opera, If the problem began in IE then any additional browsers will be effected. Fix IE fix the other ones!
Firstly you want to make your homepage simple as this will help the initial loading of the browser
1. Open IE, Select Tools and Internet Options
2. Under homepage change it to something like "www.google.com" simple and easy to load
3. Select the Advanced Tab and make sure the following is checked
Under the Browser heading
Disable Script Debugging (Internet Explorer)
Disable Script Debugging (Other)
Use Passive FTP
Under HTTP 1.1 Settings heading
Use HTTP 1.1
Use HTTP 1.1 through proxy connections
Under Security Header
Use SSL 3.0
Use TLS 1.0
Apply, Ok and close the browser. Double click IE and see if it still gives you the error message
Regards
Craig