http://www.fixya.com/support/t9833529-delete_everythingKeep in mind this would erase the hard drive and reinstall the OS and other software that was on the computer when it was new. So, any important files not backed up before doing this would be lost.
However, I believe the posts in this discussion up to this point do not clearly indicate taking this action is necessary. You still have not posted an up-close screen print to clearly show the problem you're having, or thing you have, with Word and Excel.