<<Which is a better protection system: AVIRA or Malwarebytes?>>
You are talking golden delicious apples...versus cooking apples, IMO
Any AV is a constant on the system...and should be treated as such. I don't know why you are paying for Avira, Avira Free seems to do the job very effectively for many.
Gizmo's - Best Free Antivirus Software Gizmo's Tech Support Alert - http://www.techsupportalert.com/best-free-...us-software.htm
Avira Free is highly recommended by many, I like it.
As a secondary line of defense...there are programs like Malwarebytes and SUPERAntiSpyware which should be installed on a system, IMO.
SAS is very good for spyware, adware...while Malwarebytes is an on-demand scanner for malware (also very good).
Neither of these will catch everything, which is why a number of tools are needed to defend the system.
As for these bogus AV programs...they cannot necessarily be defended by any AV...that much should be evident from reading about them.
That's why there are seemingly complex instructions for nullifying these malware items...it's not as simple as "run a scan".
For reference: BC Security Master Removal Guide
I am moving your thread to Am I Infected, where you can get the support you need