This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thunderbird

  • 1 reply
  • 1 has this problem
  • 4 views
  • Last reply by christ1

more options

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.

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.

All Replies (1)

more options

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