How can I fix a 'certificate error navigation blocked' message in Internet Explorer on Windows 7?

To fix this in Internet Explorer on Windows 7, you can try several steps: 1. **Check your system date and time**: Incorrect settings are a common cause. Ensure they are accurate. 2. **Install missing root certificates**: Windows Update typically handles this, but you might need to update manually. 3. **Clear SSL state**: Go to Internet Options > Content tab > Clear SSL state. 4. **Disable certificate revocation checking (not recommended for security)**: In Internet Options > Advanced tab, uncheck 'Check for server certificate revocation'. 5. **Add the site to trusted sites (with caution)**: Internet Options > Security tab > Trusted sites > Sites > Add. Only do this if you absolutely trust the website.