Hi, I've got a problem after upgrading BOINC to version 7.0.25, then .26 and now .27.In a log, I have this:

[error] Process creation failed: A required privilege is not held by the client. (0x522)

Version 6.12.x worked fine, so there si something strange in this version. The important thing, the computers are connected to a domain. Computers without using domain works fine with version 7.0.x but these not. Because of working fine in version 6.12.x this could be a bug in a 7.x versions.

It's not a bug.
The 6.12 version shouldn't have worked either, unless you installed that with the administrative (/a) flag, which just unpacks the contents of the installer. Or you first installed 6.12 and then later added that system to a domain.
I will bet that you won't be able to install 6.12 again either, you will get the same error, or you will get the error that the boinc_admins group cannot be made, or your account cannot be added to it.

There's most probably been one or more security tweaks to the domain since you installed BOINC 6.12, which adjusted the way that the BOINC limited user accounts can do their work with BOINC (log on, run things).

But these should mainly affect you when you have BOINC installed as a service (protected application execution), as when it's installed as a user, whenever that user runs BOINC, and the project science applications, they'll all run under this user's account (aka Administrator, or the first user being an Administrator).

Unless you've set that other users are allowed to control BOINC through BOINC Manager. Then these users are added to the boinc_users group, which requires access to the BOINC directory and (mainly) boincmgr.exe).

In any case, in the Release Notes we warn against BOINC being incompatible with domain controllers, but ex-equal, BOINC is also incompatible with computers running on that domain. All because of the limited user accounts that need to be made. BOINC 7.0, being a major update, makes them anew, with new privileges.

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Thanks for the answer, computer was conected to the domain when I installed BOINC and installation as protected service was successful, but after joining a project the problems occured.
Is there any possibility for the future versions of BOINC to be working again with domaing controllers? There could be for example some special option for this and it could use the old method as 5.10.x version.

update:
Now versions 6.10.x and 6.13.x does the same problem. But I tried to add users boinc_master and boinc_project to administrator group and now it seems that it is working. It is computing, no errors, I'll check it tomorrow for the new status.

Well, no progress. I tried to install it as local administrator and again. It looks like it compute while the local administrator is logged in but after logging out errors appear. So I will have to install BOINC v5.10.45 there.