Yup, it was a SafeDisc issue.

How did you solve it? I got the same issue.
When running as admin, it asks cd key. When I enter it, it says it is invalid.

MrEWhite wrote on 2020-03-30, 06:44:

Whenever I try to load up a level on Half-Life Opposing Force with version 1.0.1.6, I get an error that says "Please login with administrator privileges and try again." Half-Life and Blue Shift work fine. Any help here? Could it be a SafeDisc issue?

I think you need a no cd or update to a newer version

peke12 wrote on 2020-11-02, 00:28:

How did you solve it? I got the same issue.
When running as admin, it asks cd key. When I enter it, it says it is invalid.

I needed a no-cd as SafeDisc doesn't work on W10.

MrEWhite wrote on 2020-11-02, 16:47:

peke12 wrote on 2020-11-02, 00:28:

How did you solve it? I got the same issue.
When running as admin, it asks cd key. When I enter it, it says it is invalid.

I needed a no-cd as SafeDisc doesn't work on W10.

Where did you find your no-cd?
I know sites like gamecopyworld but I don't know if it is safe to use these.

GCW has always been safe for me. Just don't click on any of the banners I guess.

As a general rule, have NoScript always installed on your browser.

Is there any way to reactivate SafeDisc in Windows 10? Many games don't even have a proper crack, GTA2 doesn't have one , thus it requires a mod which also removed CD Audio.