computer reboot after diconet dial internet (XP)

Gateway - Solo 1200 Win XP.

I setup  the dial options ( IE - Conections...) to connect with my ISP my computer but it is rebooted after manualy  internet disconnection. ( ISP : Bellsout or JOY)

I installed just to test a CD from other ISP (Netzero), It works OK, I note that Netzero handled the disconection closing ports.

I already formated my HD, Reinstaled WIN from recovery CD, Instaled last Up-dat to XP and service pack. Then... I think is a hardware problem or bios, but.. Why it work whit netzero and how to fix it ?

What to Do ??? Thanks.
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wlennonVP of Domestic & Int'l OperationsCommented:
Hello Paulo, all Note books have propriatay software, even though you have re-installed the orignal pre-loaded software, with XPSP2 there could be some compatibility problems.  Below is a link to you Gateway, try choosing the latest drivers and software patches, especially the BIOS, and Modem.  There are 18 downloads for you Notebook. 


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