Hi i have a big problem, all AD users have read access to top level site and some sub sites! i understood this problem after i restore my backup in new farm? please help me

Mojgan, I think you have the default AD Group in some the group "NT AUTHORITY\authenticated users". Check all the groups and see if this groups is included. Go to Site Actions > Site Settings > People and Groups Browse through all the groups to find this group and once you find it select it and from Action > Remove User From Group Sameer Dhoot My Blog : http://sharemypoint.in/ | http://Intellects.in/