Hi
Although I don't have avutil-52.dll on my Vista system running VP version 2.41 and VP version 3.29 , I do have avutil-49.dll and two copies of avutil-50.dll in my AppData Roaming folder in the NCH file, Components. Do you have this folder and have you checked it?
As I understand it, (and I probably don't!) avutil-52.dll is a Windows 7 .dll file used by third party applications like Videopad and not a Videopad file as such, so I am not sure if it is actually part of the download or if it is copied from Windows during installation. If for some reason you don't have it on your PC, VP can't possibly copy it into it's own folder so giving the message.
Looking on Google, it seems you can download it from numerous sites, although not sure how reliable that might be.
Any response from NCH?
Nat