Try making Internet Explorer your default browser if not already and also advise what version of IE it is (Help-About).
If it is IE6 got to Tools/Internet Options
Under the Security tab make sure all zones are set to default, unfer the Advanced tab also defualt, click Apoply and OK.
If IE7 or 8 go to the Advanced tab and click Reset, click Apply and OK. Close and reopen IE and go to Tools/Add-ons and re-enable the add-ons.
See if that helps.
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