I can't open Excel, but I use it all the time.  It's not a recent install,
and I haven't recently installed anything else.  I can still access other
parts of Office like Outlook, Word, and my powerpoint viewer.  

When I try to opent the program I get, "Preparing to install," "Gathering
Information," and "The Feature you are trying to use is on a disk, please
insert Microsoft Office..."  and so on.  Problem is, this computer came with
office already installed so I don't have a disk.

I'm not real tech savy so I hope this gives enough info for somebody to help
me out.  Anything would be appreciated.

Thank you.