Help! Major "Security Certificate" Errors when browsing

The various Mac Forums I've tried have attempted to help (can post their solutions if needed), but none worked. My issue occurs on ALL of my home computers (MacBook and iMac using wi-fi) and ALL of my browsers (Safari, Firefox, Chrome).
The problem:
- Security Certificates: They pop up daily for Facebook mostly, but also Twitter. I will click Continue, which takes me to...
- 404 Error/Page Not Found Error: After the Certificate error mentioned above, this happens. Mostly to YouTube. It will stay like this for a few hours. I've cleared cache, rebooted, etc. etc. Nothing works.
- Images turn into little blue boxes with a question mark in them. **When this happens, it's an indication that a Certificate box will pop up out of the blue.
- Even on Google.com, it will say: Invalid URL
The requested URL "/", is invalid.
Reference #9.df260e6b.1336506889.420cf4f
So what can I do? It happens on both my Macbook Pro and iMac - both connected wirelessly to a Linksys router/cable modem. The router is
Wireless-N Broadband Router
WRT160Nv3
with
Firmware Version: v3.0.02

1. Certificate warnings are there for a reason. Simply ignoring them and clicking continue is generally the worst you can do.
2. For the a certificate warning, look into the certificate and post the details.
3. What happens, if you connect the computer directly to the modem? Do you have the same problem?
4. Download the latest firmware for your router and upload it to the router using the web interface at http://192.168.1.1/

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Message was edited by:
balzacvietnam

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Help! Major "Security Certificate" Errors when browsing

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