1. Open the .xls file in question and click OK after getting the error mentioned above.
2. Open the Visual Basic Editor (Alt+F11)
3. Open (if they are not already open) one of the modules or code behind forms
4. Click on Tools / References...
5. In the pop-up window click on Browse...
6. Navigate to [Your Windows Directory]\System32 (it may open by default)
7. Type MSCOMCTL.OCX (you'll see it in the auto-select options before you finish typing)
8. Click Open and the reference will appear as Microsoft Windows Common Controls 6.0 (SP6)
9. Save the file and retry.