Mysteriously missing Internet connection

I have little computer knowledge.  Have Pavillion notebook dv6000, Vista Service Pack 1.  Wireless internet connection good for approximately 2 years with no problems.  3 days ago I uninstalled factory installed Norton Protection that was expired and free AVG and installed Microsoft Security Essentials.  

Now, when trying to connect to wireless internet through Internet Explorer continually receive error message "Internet Explorer cannot display web page".  Tried Mozilla Firefox and was able to connect to internet through Mozilla a few times that same day until "Security alert" popped up and said to download a critical update.  After this update I can no longer access internet through Mozilla either--get error message that Firefox has stopped working.  

While still able to connect to internet with Mozilla, I installed Vista Service Pack 2.  Windows also asked for some updates, but I don't recall what they were for.  After these updates the "critical update" alert from Firefox came up and after installing it I can no longer access internet.  

Laptop shows internet connections are fine, but connection will not go through. In Device Manager, Network adapters lists Broadcom 802......WLAN and Realtek RTL.....Fast Ethernet NIC (NDIS 6.0)  

Please advise as to what else I can do.  I'm considering to a restore to factory condition through Recovery Manager, but it indicates it's best to do that while "connected to internet"  obviously I can't connect to internet.  I don't have recovery disks, but in reading some materials it seems that isn't necessary.  We just recently backed up data for a different problem, so I don't need to back up anything.  Just want internet connection.  

In reading many of the issues posted here, am wondering if some type of virus is attacking?

My situation resolved after restoring your laptop to original factory condition.  Will post if this problem appears again.  Reading the other posts, it seems if you want latest Mozilla updgrades downloan, you must remove previous versions first or will experiment fails.  Is it possible that the same could be true for Internet Explorer?

Tags: Notebooks

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