Facebook blues

I can't login to Facebook, in fact it logged me out then when I tried to log in again it said my computer was infected and I needed to click on a link and run some software I have never heard of, dodgy or what! Well I ran a full scan with BitDefender and it found a few things including a Trojan, and those are sorted or quarantined now, but still I can't log into Facebook! I do a lot of Quirky stuff there so this is annoying to say the least. I can go to the Facebook help forum but when I try to record my problem hoping that it will be sorted out I can't - guess why - yes I need to login to Facebook to report problems on the help forum! So I am getting nowhere fast.