As I remember all of this, the 64-bit version of Q-Dir messed up the context menu in regard to 7-Zip, a zip/unzip program. (The context menu is the stuff that pops up when you right-click on a file, such as a zip file.) What happened was nothing disastrous, just annoying; the context menu was more cumbersome to use to get to the function of 7-Zip.