Forum:Cant log in..help please

Can anyone help?

I keep getting this error message when i click on Club Penguin, it wont even let me log in, i just get this orange pop up box...You can only have one Club Penguin window open at a time. Please close any other windows and tabs in your internet browser to connect.

I have Windows Vista, can someone help me so i can get back in?

Thanks Beanie