Yes, please follow these instructions:
- Open the GFI LanGuard console.
- Click the Scan tab
- To the right of the Scan Target dropdown box click the Computers Group icon
- Enter the IP Addresses or range of systems you want to exclude in the 'Except for the computers that satisfy the following rules' configuration page
For the list of computers you can specify specific IP Addresses or IP ranges to scan. To exclude a system you would need to leave the IP Address of that system out of this list. The same applies when scanning computers in a text file.