Problem after upgrade to Drupal 6.2

hi there,

after upgrade my site drupal 5.x to 6.2 fine on localhost
But when im upload to server, some page can't open ???

for example when i access to http://my-site.com/my_page.html
The error message is: Page not found

Then i check some database tables of drupal
1. Check table: node_revisions
nid = 8
title = my_page

2. Check table: users_roles
uid=1
rid=1

3. Check table: url_alias
pid=346
src=node/8
alaska.html
language= (empty)

Is mean: my_page.html is exits
but when im try to access to http://my-site.com/node/8 --> i got the same error

my web is: drupal 6.2 + apache 2.0 + php 5.2 + mysql 5.1 + windows xp

So, what happen with my page ? why i cant access to it on my server ? (other page is fine)

Thank for help !