I have about 60 .pfx files for all major assemblies for a project. They are unique files, but I use the same password for all.
After an upgrade from Windows Vista to Windows 7 I get an Import Key File dialog requesting the password for them when I click Build in Visual Studio 2008.
This would have been fine, but after inserting the password I get an error dialog: Error Importing Key - Object Already Exists.
Any ideas?
Solved it!
After the upgrade from Vista to Windows 7 the permissions of the folder containing certificates C:\Users\All Users\Microsoft\Crypto\RSA\MachineKeys had changed.
After changing the permissions granting full access the problem went away.
Let me know if this was helpful to anyone! :)
I didn't really want to start changing file permissions to fix this. But the answer about file permissions did push me in the right direction.
Instead of changing the file permissions I ran VS.NET as administrator, which also resolved the key import problem.
来源：https://stackoverflow.com/questions/1341108/certificate-problem-error-importing-key-object-already-exists-after-windows