Exception in module AVCENTER.EXE error in Avira

Hi! Techyv People,
I am working with my daily routine, collecting all the reports from sales personnel assigned in the field, by means of email attached they send reports.
I observed that my computer is not running on its usual speed and I suspect for some virus infection to my computer.
I decided to do a virus scan of my computer using Avira AntiVir Personal Edition Classic.
When the scan has finished, it found a lot of viruses and an error message appeared on my screen which I pasted below.

As I read on the error, my Antivirus is malfunctioned.
Please advice me on how to fix this error so I can clean the virus lurking on my computer.
Thank you.
