VS2010 keeps cancelling the importing of my key files

When I built some of my VS2010 projects, which were strongly signed, on my new Windows 7 machine, I kept getting this error:

The text goes something like this:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1970,9): error MSB3325: Cannot import the following key file: MyStrongNameKey.pfx. The key file may be password protected. To correct this, try to import the certificate again or manually install the certificate to the Strong Name CSP with the following key container name: VS_KEY_A17E1D1A20966ADB

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1970,9): error MSB3321: Importing key file "MyStrongNameKey.pfx" was canceled.

So, to solve this I simply went into the properties of the project, selected the "Signing" tab and browsed for the pfx file:

Once found, I selected it and provided the password to the private key of the file:

Once reloaded, the project would easily rebuild.