If CCleaner doesnt solve your problem or you are not comfortable with it, do the following:
Click Start, Control Panel
Right-click the invalid icon and choose Create Shortcut
Click Yes when windows asks you to create desktop shortcut
In the Desktop, right-click the newly created shortcut and choose Properties
Click on Change Icon button. You'll then see the actual CPL file name in the resulting dialog.
Using the CPL file name, you should be able to trace the application, use windows search. Then, simply delete the .CPL file.