Thanks for the help. I guess I should have been more specific in my description. Yeah, I've already done that... then doubted myself and checked it again. This is happening at work where I use IE. At home I use Firefox, and most enjoy it- though all of the sudden my google search utility in FF has stopped working and I'm not sure why... but anyway, Microsoft Outlook is already set to be the default client.
I've looked additionally through all the settings in OE and Outlook and haven't seen anything regarding this issue among them.