It looks like you have a few issues in your process. The error message you are getting basically means "your SSL cert is messed up". The first issue I see is in your makecert process. You are missing some switches that are required to make a proper cert file. Beyond this, using a local cert like this should only be for testing, and not for your live application. For your live application, you should be using a real cert from GoDaddy, Thawte, or one of the other providers. In the meantime, however, here is a good resource on making your own cert:
http://msdn.microsoft.com/en-us/library/aa140234(v=office.10).aspx[
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Once you get to the point of using the signtool, I would recommend using the wizard. It is so much better at showing you what you need to do next compared to the command line. Here is a tutorial on how to do that:
http://www.thegeekstuff.com/2010/03/microsoft-digital-signatures/[
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