How to disable "This connection is untrusted" ?

I just installed a fresh windows xp on my pc and I'm using the latest FF 26.0,but from the start i cant get to some pages,like in youtube,some pages doesnt come up and i get the "This connection is untrusted" page,in the technical details it says "youtube.com uses an invalid security certificate,the certificate is not trusted because no issuer chain is provided.(Error code:sec_error_unknown_issuer).
also when i open FF add-ons manager tab Extensions,Appearance,Plugins and Services are ok but the Get Add-ons tab is not working,i get the same page as i stated above with the same technical details (instead of youtube.com it's services.addons.mozilla.org) and same error.
I've tried all solutions on the web and on this forum like reset FF, adjust time & date, using the "Skip cert error" add-on, deleting the cert8.db file, and so on - none of them helped me with this problem.
If it helps i use Avast! antivirus and window firewall,no other software on that pc.
I'm pretty clueless about what else i can do,any suggestion that might help?
Thanks!

Finally solved the problem...
when I found out with your help cor-er, that the issuer of the certificate is netscape i figured it has something to do with my internet provider, since im using special provider that blocks "adult" sites and other harmfull sites,i needed to add a certein certificated from my provider's web site,after doing so all problems were gone immidiatly.
Thank you so much for the quick respond and all the help!

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