I might've written it to advanced, but here is the easy version (you will have to translate to your finnish version yourself):
start MMC (windows-key + R), write mmc <ENTER>
Once mmc is up, open File->Add/Remove snap-in...
Choose the snap-in: "Group Policy Object" (looks like an open scroll). Doubleclick it so it goes into the list on the right. In the popup just press "Finish".
Then press "OK" to get all the way back out to the MMC.
Here is how it looks like when I have denied rollback for windows installer.
