I upgraded my laptop from Squeaky clean, problem free W98SE to W2KProSP3. Then I updated it to SP4, followed by a rollup pack, Windows2000-KB891861-v2-x86-ENU.exe.

I installed a handfull of software properly, and everything was OK for a day. Then I went to open Device Mgr, and got notice that I didn't have permission to uninstall any devices. I also got BSOD when I tried to install ZoneAlarm.

I've been running W2KproSP4 on my desktop for about 2 years and have never dealt with permissions.

I tried fast repair from Windows CD, and that didn't fix it. I then ran setup/repair and that reinstalled it to SP3. I then ran SP4 flawlessly. When I
tried to run rollup pack, it gave me :

Setup Error
You do not have permission to update Windows 2000. Please contact your system administrator.

So I contacted myself. "Self", I said, "why is this happening?" I told me to submit it to this awesome forum for speedy solution.

Thanks in advance!