Open proxy ban

Sometimes when I try to edit a page, there is a warning stating that I am banned from editing for a year because of open proxy thing with an IP address. I don't know much about IP addresses, and I didn't know why I was banned, I have an account which does not deal with anything related to my IP address, but it won't let me edit. Sometimes it changes from 11 February 2012 - 11 February 2013 to January 2012 - 2013. And sometimes I'm allowed to edit again, like now. Can someone help me unblock my IP address or just my account, thanks!