It could be one of the Internet Explorer Add-ons is causing a problem or it is conflicting with another add-on.
Start Internet Explorer withour add-ons:
Click Start, then click Run and in the Run box type in iexplore.exe -extoff
Internet Explorer should open up without a home page and on the screen will tell you it is working without add-ons. Try and browse some of your websites.
Does this error happen when you try this? If it doesn't, go to Control Panel > Internet Options, click the Programs Tab at the top then click the Manage Add-ons button. Go through the list of add-ons that are currently installed and disable the ones you recognize like Google or Yahoo toolbars, etc. Don't disable any of them that you know the publisher for, like Microsoft or Java (Sun Microsystems)
If the error still occurs, the Internet Explorer 7 you have may have an error. You can back up your favourites list, the go to
http://support.microsoft.com and download and re-install IE7 or download and install the new IE8.
Also, if it occurs on a specific website like Facebook, update some of your website add-ons. Go to
http://www.java.com or
http://www.adobe.com and install the latest Java and Flash Player.
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