I can't get on Thunderbird it says: The proceedure entry point PKll Derive with flags could not be located in the dynamic link library c:\Program files (x86)\ Mozilla Thunderbird\xul.dll. Then another window said couldn't load xpcom. What do I do now to get my emails again. my provider is Comcast and so is my email.
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Uninstall your current version of Thunderbird. This will not touch your profile with all your existing mail and data. Download the recent version from https://www.thunderbird.net/ and install it. Start Thunderbird.
Note, it is always recommended to create a full backup of your Thunderbird profile on a regular basis. https://support.mozilla.org/kb/profiles-where-thunderbird-stores-user-data#w_backing-up-a-profile