Which one does Fiddler go for? I know there are many in the system and in my case this came up after some suspected corruption due to hardware issues, but I need to get it up and running until the new hard drive goes in. Any ideas toward this end are appreciated.
As a managed application, Fiddler doesn't directly consume comctl32; it instead relies upon the WinForms controls provided by the .NET Framework. Under the hood, those controls rely upon the native Win32 controls in comctl32, but this isn't something that Fiddler itself is aware of or cares about.
You didn't mention whether you saw an error message of some sort? You will likely need to reinstall or update the .NET Framework if it is having a problem binding to the native Win32 controls.