Windows 7: browser crash when seach in google

hi, i m using windows7 with norton internet security 2010 from long time, and it's work well.
but from last few days, there is a problem with the network connection become unavailable suddenly. when i run network diagnostic it fixes all and run again, but it repeatedly happens ten or more times a day.
again from yesterday one new problem arise, when i searches something in google or yahoo from IE or chrome or opera or firefox, browser crashes automatically, while other surfing working well. i have uninstalled antivirus, scanned by malwarebytes but no result.

kindly help me........

Disable your Norton safe web browser addon(s)