What ISP do you use? Could be to do with the download speed? Or check to see if you have cookies and Javascript enabled? Norton may have disabled these.
If you have JavaScript disabled, please follow instructions listed below to enable JavaScript.
Internet Explorer 5 and later:
Click Tools, then click on Internet Options.
Click the Security tab.
Click the Custom Level button.
Scroll to the Scripting section. Under Active scripting, Allow paste operations via script, and Scripting of Java applets, check Enable.
Click OK button.