I am running Excel 2007 on a Dell XPS desktop using Windows vista. I had excel open and when I came back to my computer, I had noticed it had rebooted. When I tried to open Excel files I got this message: windows cannot find <name of file>. I had noticed this was also the case with excel files in my thumb drive attached to the computer's USB port. When trying to create a new excel file, I get the same error message. Word files work fine as well as Internet applications. My assumption is that Excel got corrupted (which is a crisis for me because I have my business and tax files on Excel and on that thumb drive as a backup).
So unless there's something else involved, I would have to reinstall Excel. If that is the case, the problem I have is that I got this computer from my Brother-in-law and have all the installation discs that come with it including the operation disk but that only re-installs windows. I don't see a windows office disk and thus I assume Office was installed by the retailer when he had purchased the system.
I would think that there would be a backup of excel on this system that I could access as well as a file that would have the activation code but have no idea where it is. Not sure what to do.