Direstory.delete problem!!!

Question

Hello every body :)

My problem is that I used a class to uninstall the application with a setup project, but after uninstall, the tool is completely uninstalled but the application folder is not completely removed, some DLLs still in the folder.
It seems that directory.delete() doesn't remove these files, but it doesn't generate any exception and the uninstall is successfully terminated.

I need ur help and ur suggestions.

Thanks in advance :)

Remarque: i didn't have this problem in an other PC, the application folder is completely removed!! I can't find the problem :(