WRONG FILE COUNT ON FULL SYSTEM SCANNING WITH NIS 2009

I have installed NIS 2009 on many PC´s!

Installation is always fast and problem free.

However on several occasions a fully updated NIS running a full system scan takes the right time, seems to go through the same files and folders as other similar installed machines, but just does not "count" them correctly and return a total number of scanned files as maybe 40 to 80 grand total!!!!!!!!!!

Most of the similar installed machines states several hundreds of thousand of scanned files, which should be "normal"!

I have tried to uninstall the problematic machines, used Norton clean tool and reinstalled.

Same peculiar results.

This is beyond me, any plausible explanations and/or things I can try?

 

PS:

 

Again, NIS 2009 probably does what it should and find whatever is there to find, but just not list the number of files scanned anywhere near correctly.