I have PRTG running on a Win 2008 R2 server with a probe on a Windows 7 64bit PC. I have noticed lately that getting information from WMI on the Win 7 PC has not been working, it returns an error 80041017: The query was not syntactically valid. Upon checking the wmiapsrv.exe in TaskMgr it is using over 1.3GB of memory. AFter rebooing the PC, I can see the memory usage of wmiapsrv.exe increasing, when I stop the PRTG Probe service, the memory usage of wmiapsrv.exe does NOT increase.
I have upgraded PRTG to the latest version today and the problem still exists.