Not sure if this is the right forum, but when attempting to open any downloaded files other than those outside Microsoft Office, I get the message "Class not Registered." I get the same message on all browsers (all updated too). For what it's worth, I just got done uninstalling some programs and condensing some folders on my hardrive - I figure I did something dumb that caused this to happen. Unfortunately, I have no way of knowing what exactly it was, so I hope someone here knows what it is I need to do to fix this. Thanks!