PHP + sessions & cookies

Ok, this is the session part in my PHP.ini (php v4.3.2.0, Apache v2.0.4.6, Windows 2000 ADS):
[Session]
; Handler used to store/retrieve data.
session.save_handler = files

; Argument passed to save_handler.  In the case of files, this is the path
; where data files are stored. Note: Windows users have to change this
; variable in order to use PHP's session functions.
session.save_path = c:\php\sessions\

; Whether to use cookies.
session.use_cookies = 1


; Name of the session (used as cookie name).
session.name = PHPSESSID

; Initialize session on request startup.
session.auto_start = 0

; Lifetime in seconds of cookie or, if 0, until browser is restarted.
session.cookie_lifetime = 0

; The path for which the cookie is valid.
session.cookie_path = /

; The domain for which the cookie is valid.
session.cookie_domain =

; Handler used to serialize data.  php is the standard serializer of PHP.
session.serialize_handler = php

; Percentual probability that the 'garbage collection' process is started
; on every session initialization.
session.gc_probability = 1

; After this number of seconds, stored data will be seen as 'garbage' and
; cleaned up by the garbage collection process.
session.gc_maxlifetime = 1440

; Check HTTP Referer to invalidate externally stored URLs containing ids.
session.referer_check =

; How many bytes to read from the file.
session.entropy_length = 0

; Specified here to create the session id.
session.entropy_file =

;session.entropy_length = 16

;session.entropy_file = /dev/urandom

; Set to {nocache,private,public} to determine HTTP caching aspects.
session.cache_limiter = nocache

; Document expires after n minutes.
session.cache_expire = 180

; use transient sid support if enabled by compiling with --enable-trans-sid.
session.use_trans_sid = 1

url_rewriter.tags = "a=href,area=href,frame=src,input=src,form=fakeentry"

This is my code (well, the important part of it):
session_start();
    session_register('username');

This is my message:
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at c:\php\webroot\snook_new\index.php:14) in c:\php\webroot\snook_new\index.php on line 85

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at c:\php\webroot\snook_new\index.php:14) in c:\php\webroot\snook_new\index.php on line 85
Success!
Warning: Cannot modify header information - headers already sent by (output started at c:\php\webroot\snook_new\index.php:14) in c:\php\webroot\snook_new\index.php on line 92

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