Can't log into Youtube? cookies, maybe?

I haven't had that problem, but try using a different browser and see if that fixes the problem, if not try seeing if your browsers are blocking sites from submitting forms (under tools, options, advanced if your using firefox, or preferences if its not under options..can't remember which). But I would check first the firewall, and popup blocker and be sure to have sites accepted for both the firewall and blockers as they are usually the crooks in these "crimes" or problems