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You should be able to do a system restore, if that doesnt work simply reinstall the excel from your Microsoft Office.
You may be referring to functions, of which Excel has many types of.
All versions of Excel should work with all versions of Windows.
2-3 times a week
SAVE YOUR WORK FREQUENTLY
The best way to become an expert or professional at using Excel is to practice and read the help files. Go through all of the topics in the help files and practice with them while creating different worksheets and workbooks. Excel is a really fun program to work with.
If you have Excel and the file is not protected, then you should be able to work on it. If not, open the e-mail on a computer with Excel or try opening it through something like Google Docs.
go on to Microsoft excel and do what you want
By working hard and knowing your job well and becoming really proficient at doing it, then you will excel at work.
You should not delete data that is crucial to the working of the spreadsheet. You should not delete data that will interfere with how formulas work.
'How do you do formulas on excel and continue to work with answer as a numerical value and not a formula '