help! wp-login.php error

I just installed wordpress onto my site to test out it’s capabilities. It was working fine untill, my web browser crashed while I was in the widgets section of the admin page.

now when I go back to the login page at the top of the screen I get an error message reading:

“Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/c/a/scallion/html/blog/wp-includes/functions.php:2) in /home/content/s/c/a/scallion/html/blog/wp-login.php on line 12”

and if I attempt to login, it takes me to a page which displays the following errors:

“Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/c/a/scallion/html/blog/wp-includes/functions.php:2) in /home/content/s/c/a/scallion/html/blog/wp-login.php on line 12

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/c/a/scallion/html/blog/wp-includes/functions.php:2) in /home/content/s/c/a/scallion/html/blog/wp-includes/pluggable.php on line 369

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/c/a/scallion/html/blog/wp-includes/functions.php:2) in /home/content/s/c/a/scallion/html/blog/wp-includes/pluggable.php on line 370

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/c/a/scallion/html/blog/wp-includes/functions.php:2) in /home/content/s/c/a/scallion/html/blog/wp-includes/pluggable.php on line 331″

My knowledge of PHP is pretty basic so I don’t know what to do from here. Do I have to start from scratch or is there a way to fix this?