How to stop getting this warning about going to an unsecure page?

I keep getting this warning
"Although this page is encrypted, the information you have entered is to be sent over an unencrypted connection and could easily be read by a third party"
Now i am not sure how to encrypt my internet but everything i have looked at wants me to pay for some kind of product that has little to no reviews. There must be a way to get rid of this or protect myself without spending hours of my time or money out of my pocket. Any ideas guys?

If this is in Safari, Open Safari if it is not already open.
Choose Safari > Preferences, and then click Security.
Turn on “Block pop-up windows" and then you want get those annoying Pop Up windows, but i have seen that they come if you open certain Web Sites . .

HTH

EDIT : Is this in FireFox ?? If so then look at this thread http://support.mozilla.org/en-US/questions/954660

its firefox

Google is your fiend and a search would reveal this:-

Pop-up blocker settings, exceptions and troubleshooting | Firefox Help