Make sure your Java is updated and try disabling any addons to see if one of them is causing the error.
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This issue caused me much pain before finally getting to root cause. It wasn't latest Java version, it wasn't the microsoft fix, it wasn't setting a registry key or anything else that folks were suggesting. It was caused by Mcafee Siteadviser BHO.
Disable SiteAdviser and I'll bet your problem goes away as well. Go to > Tools > Manage Add-Ons, scroll down to Mcafee Siteadviser and disable.