Hi There I seem to be having the same problem.
My N2009 Version is 16.5.0.135 is not working properly, it says: "Scanning commonly infected arrears....", but it doesn't list the files as they're scanned or the number of files scanned. I even ran it overnight and nothing changed.
Can you help?
My system details are below
Vista Home Premium
RAM 3GB
Inter Quad
HD 688GB
HD Free space 620GB
Thanks
Thedoctor