Problem with Session functions (NT5+IIS)

Hi ! I've a problem when i uses a session function such as session_register or session_start: the page contains any data ! I've seen many peole had this problem, but how had they made to fix it ? Thanks. Script : <? session_register("count"); $count++; ?> Hello, you have seen this page <? echo $count ?> times. <BR> The Id is <?=SID?>. Php.ini : [Session] session.save_handler = files ; handler used to store/retrieve data session.save_path = c:\winnt\temp ; argument passed to save_handler ; in the case of files, this is the ; path where data files are stored session.use_cookies = 0 ; whether to use cookies session.name = PHPSESSID ; name of the session ; is used as cookie name session.auto_start = 0 ; initialize session on request startup session.cookie_lifetime = 0 ; lifetime in seconds of cookie ; or if 0, until browser is restarted session.cookie_path = / ; the path the cookie is valid for session.cookie_domain = maisel.enst-bretagne.fr ; the domain the cookie is valid for session.serialize_handler = php ; handler used to serialize data ; php is the standard serializer of PHP session.gc_probability = 1 ; percentual probability that the ; 'garbage collection' process is started ; on every session initialization session.gc_maxlifetime = 1440 ; after this number of seconds, stored ; data will be seen as 'garbage' and ; cleaned up by the gc process session.referer_check = ; check HTTP Referer to invalidate ; externally stored URLs containing ids session.entropy_length = ; how many bytes to read from the file session.entropy_file = c:\winnt\temp ; specified here to create the session id ; session.entropy_length = 16 ; session.entropy_file = /dev/urandom session.cache_limiter = nocache ; set to {nocache,private,public} to ; determine HTTP caching aspects session.cache_expire = 180 ; document expires after n minutes