Event ID 1091 Group Policy … failed to log RSOP.

The Group Policy client-side extension IP Security failed to log RSOP (Resultant Set of Policy) data. Please look for any errors reported earlier by that extension.

Event ID 1091

The Event Viewer may look something like this:

Event Viewer 1091

 

Resolution
Create a batch (ie. fix1091.cmd) file with the following content.

mofcomp exwmi.mof
mofcomp -n:root\cimv2\applications\exchange wbemcons.mof
mofcomp -n:root\cimv2\applications\exchange smtpcons.mof
mofcomp exmgmt.mof
mofcomp rsop.mof
mofcomp rsop.mfl
cd..
regsvr32 /n /i userenv.dll

Reboot, do a GPUPDATE /force. If errors continue, then:

regsvr32 /u scecli.dll
regsvr32 scecli.dll

Do a GPUPDATE /force, then check Event Logs. Should be clean.

Inspiration and further troubleshooting
http://www.eventid.net/display.asp?eventid=1091&eventno=2716&source=Userenv&phase=1