Strange codes at the top of my website

You have a plugin or a theme problem.

Turn of your plugins for starters.

I Cant even log into the administration dashboard do you know any other way i can login?

Go in via FTP.

Rename the plugins folder to plugins-old.

i have only two plugins all in one seo and addthis i don’t think they are the problem. i guess i have to reinstall wordpress and see if everything will work perfectly. thank you for your help i appreciate your time

Then you need to try your themes.

Delete everything in themes EXCEPT for twentyeleven.