Hi chizra Happy Independence Day


There is no other antivirus, however there are programs like spybot, ad aware and stinger and as far as i know they don't have any known conflicts among each other.
In general, I would say that you are correct. Certainly the free versions are on demand, and Stinger is a specialist, on demand tool.

SpyBot might cause a problem as it has an interactive element called "Teatimer". I have known this to cause conflicts on rare occasions, but not recently. It is a user option to enable it, if it is running you should see a little blue and white icon with a gray padlock down in your system tray.