If you have gotten the WPIE15.exe error installing VB6 the reason is probably the install source. Visual Studio 6 comes from an era where we were installing on a physical computer, which of course, had a physical CD drive, which of course, had a drive letter assigned that almost never changed. So, when you installed any Visual Studio language from a CD, which you almost always did (even if you had an iso you burned a CD for the install), the installer remembered that drive letter.