[Schottlandru]

Thanks for your post - Well, this is a pretty new audio system from a specialised dealer, DPC latency optimization etc done. PT gui has never been smooth, so unfortunately there is no "system restore" except for putting it back in the box.
I would like to find a way to localize the windows process doing the security audit call.
I think it might be linked to a user account synchronization call, but will need to hunt that down in detail.

Win update is sth I will do when in between be projects, as that tends to create other issues (it tends to update drivers of other components and those sometimes mess up DPC latencies).
I have had this do more harm than good (or should I rather say more work in the end) in the past.
Will see if using OOShutup to stop user sync does anything.
Optimization, AFAI remember, recommend keeping all Microsoft services running, or is there a list of which to disable?