After uninstalling nightly, I can no longer set firefox as default browser for email links and they no longer open.

When I try to change the default firefox protocols in windows, only the nightly shows and I can not unclick it. When I attempt to click on a link in an email (Windows Live) I get "Class not registered"
I presently have IE set as my default because it is the only possible way to open email links.

You can install both win32 and win64 Firefox Nightly builds on a 64-bit Windows computer. As you should know, all Firefox nightly builds are intended for testing only. If you downloaded your Firefox nightly build from http://nightly.mozilla.org/ then you got the win32 installer. (win64 installers are available from http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-central/ and possibly elsewhere: [http://forums.mozillazine.org/viewtopic.php?p=12694481#p12694481 ref.])
Anyway, the bug report I referred to earlier ([https://bugzilla.mozilla.org/show_bug.cgi?id=870312 Bug 870312] - Installing Nightly causes "Class not registered" error on click on link in other apps after uninstall) fits your issue ("broken" uninstaller). It was triaged as a "Shell Integration" Firefox bug for x86_64 Windows 8.
Whether you had the 32-bit or 64-bit Firefox nightly installed, you can try reinstalling a more recent build of that, and then uninstall it again. That worked for a Windows user who had problems uninstalling Firefox Nightly x64 as reported in this thread:
*http://forums.mozillazine.org/viewtopic.php?f=23&t=2473175
If that doesn't work, also try reinstalling Firefox 25, to see if that helps matters.
I'm not the best person to help you, though, since I'm not testing Firefox nightly on my Win7 x64 computer. Hopefully someone will be along that can help you better, or you could try on the MozillaZine Firefox Builds forum (it's linked from the nightly.mozilla.org page).

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'''If my reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

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After uninstalling nightly, I can no longer set firefox as default browser for email links and they no longer open.

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