I have installed vista with sp2 and windows 7,dual boot system.so problems are related to windows vista.i have two web browsers IE8 and Google Chrome,when i use internet those browsers stops working.i can use internet max 20mins.then i have to reboot my pc and same thing again and again...
here is my software list:
vista+win7
firewall:zonealarm
antivirus:avast
and here is hardware:Asrock P45XE mobo,Intel Q8200 processor,ati 4670 grpahcard,pioneer dvd writer,4gb ram
Netgear RP614v4 wired router
And last point:i do not have any of those problems with windows 7!!!

In what way do they stop working? Is it that they don't connect anymore or do they crash/freeze? Have you tried fire fox? If it stops connection have you gone into network and sharing center and tried to "diagnose the connection"? If Vista is telling you that the program stopped working I don't know what to tell you about that because I myself don't know what to do about it. You could try to reinstall your browsers or install fire fox.

Yes they freezes,and reinstall doesnt help at all.And when it s get worse there is only one solution:cut the power and 5 minutes and restart windows normally.I also run next softwares:superanti spyware,ccleaner and spybot.When i last time use superanti spyware
in safe mode it founds 66 different problems.And like i said there is no these problems with win7 rc1 version.

If your anti-spyware found something then you need to make sure that it is gone. Please read this and start a new thread here.