These are directions for adding exclusions for Micro Niche Finder 5.0 specifically in Avast! Free Antivirus 5

Right click Avast! icon in system tray and select Open Avast! user interface command: In the appeared window click Settings button, then select Exclusions item and click the browse button. File or folder selection dialog will appear.  

(If you have installed Micro Niche Finder to a custom drive or folder, navigate to this location now.)

Otherwise, navigate to the default install path of Micro Niche Finder: 

C:\Program Files (x86)\Micro Niche Finder 5.0 For 64bit systems
OR
C:\Program Files\Micro Niche Finder 5.0 For 32bit systems

Select the '+' icon to expand Micro Niche Finder 5.0 folder

You will need to place check marks by the following three folders
-Micro Niche Finder 5.0

-AppData

-Data

These folders will now be added to exclusions.

Additionally, you should add these same folders to the File System Shield exceptions.For this select Real-Time Shield tab, then File System Shield item and press Expert Settings button.In the appeared File System Shield Settings window select Exclusions item and press browse button on a new row.Then you need to point Avast! to the 'Micro Niche Finder 5.0'; do this again for the 'AppData' folder and again for 
the 'Data' folder.Now make sure to place check marks in the 'R' 'W' 'X' columns for each of these entries.

You should now have successfully added exclusions for Avast! Anti-virus 5.