Web page not loading

I recently tried AVG PC Tune-up. (The trial date has ended.) Since the tune-up, however, a site (convert2mp3.net) I regularly used to convert YouTube videos to mp3 files, no longer loads. The main convert2mp3 page loads, but when I enter the YouTube url to convert it to an mp3 file, the page doesn't load. The arrow at the top of the screen just keeps turning around. I never had this problem before and I have no problems downloading from any other sites. 

I switched to the AVG default settings and it worked for one download, but that's it. If someone knows of something I can do to correct this, please post it. Thanks.

Hello Mike,
Thank you for reaching us here. Please let us know which web browser are you using to load the URL and did you try to use a different web browser. Also, do you have any anti virus program installed on your PC? If you have, please try to disable the anti virus protection temporarily and check if you can load the webpage.

Mike,
Thank you for the information. We would like to assure you that AVG PC TuneUp does not interfere with your browsing or webpages you visit. Please disable AVG temporarily and check if you can access the webpages. You can turn off AVG protection by right clicking on the AVG system tray icon. Also, please try to use a different web browser to access the webpage.

Hello Mike,
Thank you for reaching us here. Please let us know which web browser are you using to load the URL and did you try to use a different web browser. Also, do you have any anti virus program installed on your PC? If you have, please try to disable the anti virus protection temporarily and check if you can load the webpage.