Hi.
I have a toshiba tecra a2 lap top.recently I can not connect to internet by wireless,my lap top recognize and connect to networks but no data transfers.I can connect to those networks with my mobile phone and there is no problem.I removed my windows because I thought it might be useful but it didn't work!I have checked my Firefox setting there is no proxy or something.
I wondered if you could help me through this problem.
Thank you.

.i removed my windows because i thought it might be useful but it didnt work!What do you mean by "i removed my windows"?

Step by step.
1. Have you tried connecting your laptop through an ethernet cable and tried browsing?
If you can browse - then it can be diagnosed that the problem is with the wireless setting and we can move to further troubleshooting
If No - Then it has to do something with browsing / firewall settings etc and it takes another route of troubleshooting.