Try this small macro:
Sub NoArt()
For Each s In ActiveSheet.Shapes
s.Delete
Next
End Sub
Macros are very easy to install and use:
1. ALT-F11 brings up the VBE window
2. ALT-I
ALT-M opens a fresh module
3. paste the stuff in and close the VBE window
If you save the workbook, the macro will be saved with it.
To remove the macro:
1. bring up the VBE window as above
2. clear the code out
3. close the VBE window
To use the macro from Excel:
1. ALT-F8
2. Select the macro
3. Touch RUN
To learn more about macros in general, see:
http://www.mvps.org/dmcritchie/excel/getstarted.htm