It seems liekly that the drop-downs are from Data | Validation.
Did you select all the cells in which the drop-down was appearing before you
tried NeoAmit's solution? If not, select all the cells and try again.
For the Clear All solution:
Select All the cells with the drop-down.
Then, Edit | Clear | All.
It's also possible you have the AutoFilter activated. For that, click on a
cell that has the drop-down and go to Data | Filter. If the AutoFilter has a
check by it, click on AutoFilter to eliminate the drop-downs.
If AutoFilter doesn't have a check next to it, don't click on it, or you
will just make the probelm worse.
If these don't work, you may try posting back with more information about
how the spreadsheet was created. Including how the drop-downs were created in
the first place.
tj