I assume you mean Services in msconfig not system?
There are two elements to the Security Suite, one the ewido program GUI for on-demand use. The other is the Ewido Security Suite Control - Service, I assume this is what you disabled in msconfig, services.
I to have disabled this in Administrator Services, Services (set to manual start) and I use a shortcut to a batch file to start the security suite service (and the program interface) this when it is needed.
The service as far as I can tell is only required when you do the signature updates, other wise it's not required for an on-demand scan though I'm not sure but I guess it doesn't hurt to start the service, update signatures followed by a scan.