I've been having trouble logging in for two months now...What's up with that?

[Jacksone]

I have been searching the support pages and I've tried uninstalling, re-installing, everything, but it still says "DNS could not resolve..." My internet connection is fine and it's actually pretty fast, but everything except SL is working. This has been going on since October and I still haven't received any help about it.

EDIT: To Innula Zenovka, I tried doing what you suggested, but I'm still getting the exact same message. I even tried tinkering with my proxy settings to see if that was the problem, but so far I'm still getting nothing.

[Innula Zenovka]

Try changing your computer's network settings to use Google's public DNS service rather than the one your ISP provides.   That fixed the problem for me.   It's a very simple procedure, as you will see from that link.