After a recent attempt to create a virgin system by deinstalling all NI software and installing it again I hit an issue that took quite a while to resolve (FYI: Reference#1295936).
Basically, neither the file system nor the registry was properly cleansed during the uninstallation procedure.
Sometimes this behavior is desired - e.g.. if you want to keep user settings - but sometimes not.
Currently the user is neither given the option to decide whether he wants a "clean" uninstall or one which keeps data saved nor he is given information about the extend of the uninstallation.
An selectable option to create a virgin system (at least regarding NI software) either during deinstallation or later during installation (if residual data is detected) could be helpful.
This applies to all software handled by the NI installation routine, I just put it into the TS-section because there I missed it first.
I'm declining this idea due to lack of community support.