Start the UPDATE32.EXE file from the root directory of the CD to update the virus database. Or if you have downloaded the current virus database (AVAST32.VPS file) from Internet, just copy the AVAST32.VPS file to the directory, in which AVAST32 program has been installed (Program files\ALWIL Software\AVAST32\by default). Then restart the Windows to ensure the AVAST32 program will start using the new virus database.
Update of the whole program, including the virus database is started by SETUP.EXE file from AVAST32 directory on the CD. The installer will guide you through the update process. Then restart the Windows to finish the update process.
You can also use the AUTORUN.EXE program for updating the virus database or the whole program. This program usually starts automatically on inserting the CD into the drive, or you can start it the manually from the root of the CD. Then follow the on-screen instruction to complete the appropriate type of update.