session not work

i set session variable like this
<?php
session_start();
$test = "Sessionyes";
$_SESSION['sessvar'] =$test;
?>
and try to use session variable in other page.but it not work in my home computer.but it is correctly work in computer in my university.So i think this is a error of php installation.i send session detail in phpinfo() file.PLS help me.

session
Session Support  enabled  
Registered save handlers  files user  
Registered serializer handlers  php php_binary wddx  

Directive Local Value Master Value 
session.auto_start Off Off 
session.bug_compat_42 Off Off 
session.bug_compat_warn On On 
session.cache_expire 180 180 
session.cache_limiter nocache nocache 
session.cookie_domain no value no value 
session.cookie_httponly Off Off 
session.cookie_lifetime 0 0 
session.cookie_path \ \ 
session.cookie_secure Off Off 
session.entropy_file no value no value 
session.entropy_length 0 0 
session.gc_divisor 1000 1000 
session.gc_maxlifetime 1440 1440 
session.gc_probability 1 1 
session.hash_bits_per_character 5 5 
session.hash_function 0 0 
session.name PHPSESSID PHPSESSID 
session.referer_check no value no value 
session.save_handler files files 
session.save_path C:\Temp C:\Temp 
session.serialize_handler php php 
session.use_cookies On On 
session.use_only_cookies Off Off 
session.use_trans_sid 0 0 

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