I find that this spreadsheet generally works with versions of Excel called 2003 or earlier. With Excel 2007, I am aware that it might not work. For detailed instructions, after saving the spreadsheet to your hard drive and clicking on it to start it, click on the tab called "Instructions" at the bottom of your screeen.  (You might need to scroll down to see this).

If you get a error message stating that macros need to be enabled, follow these instructions to enable macros: Click on "Tools", "Macro", "Security", "Low", "OK". Then, click on "File", "Save As.." to resave the spreadsheet to your hard drive. When you re-open it, I hope it will work. If you would rather use a spreadsheet that doesn't contain macros, I recommend trying the one linked to lower on http://www.salemstate.edu/~arosenthal/mat108 called "A spreadsheet, rowop.xls, that will perform Gaussian elimination on most matrices up to 3x4".   (To use this, you might need to (1) save rowop.xls to your hard disk, by right clicking and using "Save target as" with Internet Explorer or using "Save link target as" with Netscape and then (2) double click on rowop.xls.  After the first time, only step (2) will need to be done.) 

If you want to use an excellent spreadsheet to help solve Su Doku, I recomment the one linked to at http://www.harismind.com/sudoku.html .  

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