No LAN access on Touchsmart PCIQ772.uk via Wireless or Ethernet or USB Adaptor

Hi, I'm helping a customer whose internet access suddenly stopped on June 2nd. My confidence in being able to repair it dwindled after I eliminated all the ususal suspects, so I wonder if someone could help please?
1. the PC runs Windows Vista SP1 and doesn't seem to have updated itself since Dec 2010
2. it runs Norton 360
3. Network connections shows the "Local Area Network"as: Enabled (ie not "Connected")
- Network connections shows the "Wireless Network Connection" as Not connected
Network connections shows the a known good USB wireless adaptor as Not Connected
3b. the PC is unabvle to even list any networks in the area (there are at least six)
4. I have used Device Manager to uninstall the network adaptors then Scan For Changes & Reinstall etc - made no difference
5. I've swapped routers just to be sure, and they fine with a handful of other PCs and laptops.
6. no System Restore points exist on the PC (the customer doesn't know why)
6. I've considered a Factory Restore but read somewhere that even that didn't help.
Can anyone suggest what else could be tried?
Thanks in advance,
J

Hi,
Since my last post, I decided to uninstall Norton 360 and Norton Utilities which came a part of the bundle, but no difference.
I also decided to install Vista SP2 as I know it made lots of improvements, some relating to the new Security Centre, but that also made no difference.
So, thanks for your suggestion re Flushing DNS and resetting Winsock; I'll do those next - after I work out how to reset Winsock.
PS - I also did full (slow) system scans with Norton 360 and MBAM, but the system was clean other than 3-4 PUPs, and the SFC /SCANNOW found no problems with protected system files.
I'll keep you posted on how the DNS and Winsock resets go.
Ta again,
J
Norton_Support wrote:
Did you try to flush DNS & reset winsock? You may also uninstall Norton completely & check if you can connect. Also, try if it works in Safe Mode with Networking.
Thanks!
Harry
Norton Support

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