Help me guys. I can't figure this one on my own.

I get the following error message

"Do you want to view only the webpage content that was delivered securely?"

when I am in the http://my_domain.com/shopping-cart/ and click on the "Proceed to Checkout" button I get the following error message (I think it relates to the SSL)

The exact page that gives me this error is: https://my_domain.com/checkout/shipping.html

I can't figure out how to fix this. I even restored to previous backups and it is still doing this

I Think it might be because of one of the following reasons:

I was messing around with the english.php files trying to rename the "More Info" box. but im thinking this would have gone back to its orginal state once i reverted to a previous backup.

I was messing around with the domain redirects in cpanel because my SEO guy recommened the following:

Redirect all version of your home page to one specific URL for example, redirect http://my_domain.com/index.html, https://my_domain.com/index.html, Error! Hyperlink reference not valid., https://www.my_domain.com etc to one final version like http://my_domain.com/ ( you can choose one version of your home page and redirect all other version to that final version)

I really think it might be because of the domain redirect. what do you guys think? I need step by step instructions on how to fix this. please help me because im expecting a ton of traffic in a few days.

P.S. this error is more obvious when using IE. In firefox it just shows the yellow lock symbol at the lower right hand corner with a red exclamation mark