I have the same problem. Started using trial version Parallels Desktop just some days ago to understand whether I should buy it or not. Windows Application Folder stopped opening when I click it. If I try to view it in Finder, some attempts lead to flashing of Finder window, to hanging of my Mac, or to opening of the folder with all program icons changed to white squares, then its impossible to open subfolders because it leads to freezing of my Mac. Now I'm confused with this product 'cause I cannot find any explanation for this behavior and resolution for this problem.