Installing SWV on a not clean base computer-

SWV Installation Notes state that the need for using a clean OS machine during SWV or SVS install is to avoid problems that an installation’s logic could cause: in fact an installation can contain logic that checks to see if a file is already installed and in that case important files might not be included in the installation.
To avoid the problem program developers could update SWV or SVS software so that they could intercept that logic at the moment of comparing file names, so that an always negative answer is sent back: doing so, all files could be added in fsldr by the installer.
If that can be made, possibly using the same virtualization technics used in SVS, an easier and wider use of the program could be made.