forcibly updating root certificates

[AWS]

I maintain a Java applet that is locally deployed on computers not under my control, for which I've recently gotten a code signing certificate. Unfortunately, the Windows 7 computer I'm on (as well as several others I'm aware of) doesn't recognize the

Go Daddy root certificate authority (Go Daddy Class 2 Certification Authority Root Certificate - G2, with SHA1 thumbprint 47:BE:AB:C9:22:EA:E8:0E:78:78:34:62:A7:9F:45:C2:54:FD:E6:8B).From http://support.microsoft.com/kb/931125 however, it appears that Windows will examine an unfamiliar root certificate (scroll to "More information" / "How Windows updates root certificates"

/ "Windows Vista and Windows 7"). I've seen this happen with an https/ssl request, but I can't make this happen when I download my applet.How can I force my computer to update its root certificates, in steps simple enough that I can tell my users to do that as well?Thanks

 

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