Hi Berty1,
If you wish to change or remove some of the features you do not want, go to Programs and Features (or similar) and highlight avast.
Right-click it and choose change. You must be in an administrator account. Untick features you do not want. Allow avast to complete. When done, reboot.
To prevent this scenario in the future, look to the bottom of the new install window and always select ‘Custom Install’ when you install avast or reinstall.