Much! The Registry is just one of the major components of the Windows operating system. It is a hierarchical database used to store critical system configuration settings for the operating system, installed programs and attached hardware. But it is not the only method a program uses - especially for security programs, which need to dig deep (because malware digs deep). If everything was done in the Registry, then it would be pretty simple to keep the badguys from infecting our systems.
how much deeper can you get than the registry?
Now I am confused. Avira is an anti-malware program. What do you mean by "tidbits"? I've been assuming you had Avira Free or Avira Internet Security (both are anti-malware solutions) installed, and now you are trying to remove it completely. Is that not the case?
its not anti-malware that i am am trying to remove its avira tidbits leftover
Even if you successfully remove all the Avira entries from the registry, you may still have files and folders remaining on your drive. However, they should not affect your system, unless something else has been modified. And in that case, you may have to run SFC or do something more radical. But before that, I would contact Avira tech support.