Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I wonder how stable a machineGUID is. Can a user change it? If so how and what would happen to there Windows auth key?

share|improve this question

It can be found here:


You need admin permissions to change it.

Here's some C# code to do it:

var machineGuid = Registry.LocalMachine; 
machineGuid = machineGuid.OpenSubKey(@"SOFTWARE\Microsoft\Cryptography", RegistryKeyPermissionCheck.ReadWriteSubTree, RegistryRights.FullControl); 

No idea if it will change the windows auth key.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.