How can I update the file of certificates?

Several weeks while troubleshooting very slow operation of Firefox and Thunderbird, I deleted some certificates which, by their dates have expired. I thought that they were no longer in use, or would have been refreshed by the system. Since that time a lot of attachments cause several messages warning for missing certificates or not valid and will not display, I am running XP and when I tried updating to 38 T/B it will not be installed. Is it possible to download a new package of certificates, or am I cast?

XP is still a supported operating system, but I don't really know why.

So, a new installation should work, unless you have security software or malware that prevents from functioning.

Tags: Thunderbird

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