Sidebar Gone Astray

My sidebar, instead of being on the right side of my main section, is at the bottom of my page. I do not know what to do. I have tried re-installing wp twice and reinstalling K2 twice. I must have done something somewhere that I am not aware of. Can someone please lend a helping hand? I understand that people here do not support K2, and I have posted in the K2 forum regarding this problem (with no avail), but I don’t think that the problem has something to do with K2, but something that I have done with WordPress itself. Any help advise would be appreciated.