Preparation of uninstallation
Before the uninstallation of the AVAST32 program make sure that none of the programs has been run. In other case the uninstallation will not be completed as supposed to be and some rests of AVAST32 will remain on your hard disk, or the uninstallation will not start at all; nor will it be possible to restore the internal data of the system at the end. This may be (and most probably really is) a cause of SERIOUS problems in the installation of other versions from the antivirus program AVAST32.
Have a look at the lower part of the screen on task bar. Seeing any of the programs of the AVAST32 system there, cancel it. Press the right button of your mouse and select the "Close" command for the programs run from AVAST32.