I hope Igor, the Windows 98 guru 8), can help us here…
Maybe follow:
- Uninstall avast from Control Panel first.
- Boot.
- Use Avast Uninstall for complete uninstallation.
- Boot.
- Install again by this command on the folder you’ve donwload and save the install file: setupeng.exe /forceinstall
Where setupeng.exe is the name of the executable.