Also Windows Vista. IIRC one of the main reasons users disliked it was incompatibility with some drivers and other software, but AFAIU a lot of these breakages were due to that software assuming admin permissions, and hooking into the kernel in undocumented ways, whereas Vista started the process of forcing software to actually use proper interfaces and made them actually get user permission to escalate privileges. A good thing, but which caused teething problems at first. I don't even blame users for their reaction, as the fact was their software wasn't working, regardless of the cause, but we got through that stage and now modern Windows is much more stable. I do still scorn Apple and others who criticised the existence of UAC - they should have been calling Microsoft out for taking so long to introduce it!