Older version of Safari not loading pages
I reformatted and installed Mac OS X to old iMac. Is updated to version 10.4.11 and won't update any higher. The version of Safari it is running is not loading pages, and I'm getting an error message can't establish a secure connection. I've done all the troubleshooting Apple suggests. Full internet connection. I can get on a Google homepage, I can do a Google search and when I click on the link it can't establish a connection. Trying to install google chrome, page won't load. Before I reformatted it was running OS X 10.6.8 Wondering why it won't update operating system higher?