My webcam. i go to use my webcam and it come up error and says "this application has failed to

Question

i go to use my webcam and it come up error and says "this application has failed to start because kdu_v32r.dll was not found. reinstaling the application may fix this problemI cannot open my id on yahoo messenger so i did was re install the messenger but before it was completly finish it says that kdu_v32R.dll was missing and by reinstalling it again, it will fix the problem. I did as the command says but i end up with the same problem. I cannot open my webcam when im using the messenger version 8.1 which i am using before. How can i fix this problem? My webcam is A4Tech. Thanks alotneed help with webcam installing,not capatible with Vista Newest version