Problems with PayPal Confirmation Page

Hi there!
(I have two stores I'm setting up.)

I have one store up and everything is working except Pay Pal checkout. I had tested everything within the PayPal sandbox and everything was working great. Then I transfered my Pay Pal API in the settings and unchecked the test mode and sandbox buttons in the settings and tried to make a small test purchase through the website by using my own personal PayPal account.

I first tried the purchase through the PayPal express option to test that. I was taken to the PayPal site - I logged in with my personal account, and was taken to the Review your Information page in Pay Pal. And then I hit the Confirm button. This is where the site Hung up. I then got a message from Firefox that it was DOWNLOADING the pp_confirm.php page and asked me what I wanted it to open the Pay Pal confirm page with. ???

Help? Is there something wonky with my server permissions or something here? I was hoping to fix this problem before I tried it with directly by entering a credit card. (I am using SSL on the website too.)

Also - the Google Toolbar thinks my site is in French. Any reasons you can think of for that?