How can I open an encrypted email from my mil account?

I received an encrypted email in reply to an important question. Unfortunately the email I received is encrypted with a little blue lock over the checkbox. As a result when I click on "Click here to see full version" I am presented with a blank email. I'm using the correct Internet Explore with all necessary DOD Certificates and I reinstalled the S/MIME control located in settings under options (as instructed by militarycac.com). Yet I have no access. I tried calling the help desk twice only to be told that I cannot be helped because I am using a personal computer. If anybody has some insight as to how I can fix this I would really appreciate it. Other than that I plan on making my way towards base sometime this week just to hopefully be able to open the email on an actual government computer.