Hi:

Your runtime error problem is fairly common, and is usually due to a browser extension or BHO (browser helper object) added to IE. A common culprit is the Google Toolbar, and you might try uninstalling it in Control Panel>Add or Remove Programs. Reboot, and see if the problem is gone. If it is, you should be able to re-install Google Toolbar from the Google site without the problem recurring.

If this doesn't solve your problem, in IE click on Tools>Internet Options>Advanced tab, and uncheck the box next to "Enable third party browser extensions". Close IE, reboot. If this solves your problem, and you want to determine which extension was the culprit, then re-check that box, restart IE, and click on Tools>Manage Add-Ons..., and select in the dropdown box "Add-Ons currently loaded in Internet Explorer". Selectively disable each add-on, one by one, til you find the extension responsible. McAfee's Anti-Phishing helper object seems to be a common offender.

None of the above steps is irreversible, although you may lose some browser extension functions when temporarily disabled.