Hello Mike,
Changing the colors of cells in Excel is very simple if you know an index (row and column) of the cell you want to change. The property nodes when working with Excel use the Excel format of letters and numbers to specify which cell you want to change. Since in your LabVIEW program you are probably not using this format as your index you must make a conversion from the index to the Excel format.
I am attaching a vi that changed the colors of a block of rows and columns using an index. You can also double-click the subvi "Row Col to Range Format.vi" to see how you convert each index to a letter and column to input into Excel.
Thanks,
Caroline
National Instruments
Thanks,
Caroline Tipton
Data Management Product Manager
National Instruments