Activation context generation failed for "C:\Program Files (x86)\IVONA\IVONA Reader\IVONA Reader.exe". Dependent Assembly Microsoft.VC80.MFC,processorArchitecture="x86",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="8.0.50727.6195" could not be found. Please use sxstrace.exe for detailed diagnosis.

This was a reoccuring error i kept getting I think ending the process tree of windows explorer at the time of getting this error (and i think while being in nightly) couldve started this new problem potentially

https://support.mozilla.org/en-US/questions/943596

Thought this was related but then i don't really have a startup folder full of nightly.exe ? If anyone worthy can add to this so it makes (any) sense.

Correction: It's the Developer edition

https://www.mozilla.org/en-US/firefox/developer/all/

It's also supposedly synced up to firefox, but i'm not sure, when i logged in firefox it said last lync was march 2, which is obviously false, i have definitively at least once synced it up in this past month.

where does firefox dev keep last sessions?

An error message about XPCOM missing or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files. You need to do a clean reinstall to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.

• https://www.mozilla.org/en-US/firefox/channel/

if i uninstall it from remove programs and install it again, is the profile going to be a-okay?

also, yes that does seem plausible behavior from iobit advanced system care

I don't know what files Advanced SystemCare is protecting, but your Firefox profile folder isn't stored in the Firefox program folder, but is stored in a hidden location in AppData\Roaming and won't be affected by a reinstall.

• C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\

why do you think only firefox developer edition is having issues with xpcom ,isnt it the same xpcom that both are using i know i was having issues with the second drive on which dev edition is written, could that be it?

where is xpcom located at? and if that ^ is the problem ,could a reinstall of the installation files fix this?

or maybe a change in properties/ownership

i did have prior problems with .dll's though like this ,so maybe ..?

https://answers.microsoft.com/en-us/windows/forum/windows_vista-update/dll-is-either-not-designed-to-run-on-windows-or-it/96e04287-7e81-49ab-afe5-f44449dd8322?auth=1

I think this might end up being my issue with dll files

http://www.techsupportforum.com/forums/f217/the-file-c-windows-system32-msvcrt-dll-could-not-be-opened-478045.html

http://www.askvg.com/guide-how-to-restore-trustedinstaller-as-default-owner-of-a-file-or-folder-in-windows/

trustedinstaller is on the msvcrt-dll ,not sure about the other .dll files i kept getting errors for

Any reason why the dev edition installation would be 1.6gb ?

Solved: reinstalling dev edition fixed this xpcom problem in this case.