I have done the SFC check, and there where no errors, everything ok.
I now have discovered that this 20 errors only appears once a day, if it have happend it's not possible to get the error again, unless it has gone what I think about 24 hours. That's strange!? (But I think everyone else on the net that's getting this error
also having it once a day.)
And it happens when user B swithes back to the login screen.
It has nothing to do with getting back from standby, IPv6, NIC, the file setup.etl as other hassuggest.
I haven't tried method 1 from shinmila yet, couse I already have had the error today, so I must wait until tomorrow.
I have installed Windows 7 twice from scratch and the error is still there.
(Maybe this error doesn't make any problems, but I just want to find out why, and get rid of it.
I have Norman Security Suite installed, if someone else having this problem and also running Norman.)