问题已经解决！
答案：
In case anyone is still interested, I contacted SigmaPlot about this and
their suggestion, below, resolved the problem:
"This error message
indicates an integration error between Excel and SigmaPlot. Excel 2007
has not been certified with SigmaPlot.

To resolve this issue, you need to remove the integration. Go to
C:\Program Files\Microsoft Office\Office12\XLSTART. You should see three
files excelint.exe, sigmaplot.xla, and spRemove.xla, create a subfolder
within the XLStart directory and move these files into the subfolder.
Make sure Excel is closed at the time you move these files."

谢谢 啊