Cannot Create Test Certificate in VS 2012

When I go to my project properties page under the Signing tab and click "Create Test Certificate" I get the error "Object already exists. (Exception from HRESULT:0x8009000F)"

I've also opened past projects that I've created certificates for and tried to create new ones but I get the same error.

I had no problems creating certificates in the past. I am using Windows 7 and am running VS 2012 as administrator.

Anybody encounter this problem before?

John

this solved the issue for me HKLM\SOFTWARE\Microsoft\Cryptography\MachineGuid This key should ideally have the GUID of the machine without curly braces, so {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} becomes xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx