This occurred right after running CCleaner. How can I restore this funtionality?
Need more info.
What is your operating system?
Which build of ccleaner do you have?
Did you run the registry clean part of ccleaner?
Do you have Winapp2.ini installed ?
The links in a browser or the shortcut links on your desktop?
Do you mean when you click on them they don't open ?
Usually an easy fix to this one: Set your default browser back to Internet Explorer, reboot. Then change the default browser back to Firefox.