The fact that computers are included in this report does not point to a scanning error. The report is simply telling you that the System Restore service is not running on the specified computers.
Lansweeper scans Windows services by default and there are a number of built-in reports that will tell you if specific services (System Restore, Security Center...) are not running on your client computers. What you do with this information is up to you. Either you start these services on the machines, if you think they're important, or you do nothing. If you don't care whether these services are running, you can also remove the report from your dashboard.
