System hangs with Interactive Services Dialog box open

My system version is Windows Vista Home Premium 32-bit
Comodo IS is 3.12.111745.560
VS Database Version: 2724

I have two problems:

  1. If I do a full scan of C: drive, the AV hangs and stops scannning on a particular file.
    This file will be different each time I do the scan.

  2. If I do scan of each folder in C: drive seperately, then for the big folders’ scan, at the end, an Interactive Services Dialog box opens with option to show message.

If I click on that or not, system hangs.

Now if I see the program details in that Dialog box, it shows like this:
C:\Program Files\COMODO\COMODO Internet Security\crashrep.exe incompatible with Vista…