Unable to edit cells in MS Excel 2007...

First, I went to the office button on word 2007, went to Program Name Options, went to Word Options, click on Resources and then about. I had no product id in the field, so I contacted Microsoft. They had me verify my product key, then transferred me to another tech guy. I ended up un-installing all MS office products and then rebooted. He then sent me to a site where I downloaded a clean copy of office 2007. Once downloaded, I installed, opened MS word, and entered in my product key. I activated over the internet, closed the app, went back in, and then I was able to work in the application. Turns out that the product locked after 60 days and would not let me do anything until I had an activated product key. I hope this helps.

When you open file click on is your file only readable then you will not be do anything. Find your EXCEL FILE IN BROWSER AND RIGHT CLICK AND THEN PROPERTY. NOW SEE IF YOUR FILE IS READ ONLY. IF YES THEN CHECK IT AND MAKE SURE IT IS NOT READ ONLY.