Excel Refusing to Load, Files Do not Open errors in Excel

Hello, whenever I try to open Microsoft Excel, I am getting a startup error. I cannot open any of my previous files. I have been using excel everyday but this is the first time that it crashes. It gave me errors like FILE NOT FOUND, EXCEL REFUSING TO LOAD, FILES DO NOT OPEN, COMPILE ERROR and GPF ERRORS. This is my first time so I do not know how to resolve these errors. I think maybe my Excel needs to be updated? Please advice.
