I would like to thank Tech, YoKenny and others for advice for which I appreciate very much. However, entering mbamswissarmy.sys file into "search box", I see that I'm not the only person who's had this problem! Like I've said before, Avast would be my choice of AV program but until I can be sure that this inherent fault is fixed, I'll have to stick with Avira. This file may well be a FP but with each warning I'm forced to uninstall/reinstall MBAM.
OS: Vista Home Premium SP2,Windows Firewall,MBAM(paid/realtime protection disabled), Avira Antivir Personal and SuperAntispyware Pro.
Cheers all,
BobbyZee67