Vista wireless problem

I have buyed a new laptop. A acer 5920g with a intel 4965agn wireless card.
It has Windows vista home premium installed.

I use my laptop at different locations like school and ad home. When i am
home I have no problems at all to connect to my wireless internet. When I am
at school I do have problems. I can connect to the wireless no problem. Bud
it doesnt give me internet. Everyone else who has xp has it working. Bud now
I have no idea what to do next. I do get a IP my mac is added on router, I
can ping to the server, I can ping to the FTP from microsoft. I have heared
that the problem is in the first time you start vista. Then you need to
select what wireless you want. You have 3 options. I chose Home. Bud that
doesn't work. I want to try to fix this since there are 10 laptops having
same problems as I do.

If you know a solution to fix this problem please let me know. If you need
more information I can give bud please let me know.

Frank van der Hoek