Internet Connection Problem - Virgin Media Broadband

Hi,

I've had no internet for almost a fortnight now - I had asumed the problem was with my ISP, but after hours on the phone with them, they're adamant everything is OK their end, so I need some help to check if something's gone wrong with my PC.

I've got a Dell Inspiron 530 running Vista and am connecting to Virgin Media Broadband via my TV set-top box.

(I initially thought the problem was caused by a dodgy McAfee update as the timing was right, but have followed their instruction to run a fix and have since completely removed the software and reinstalled from disk - a coincidence maybe)

The network diagnostics that I normally rely on to solve minor glitches just says it cannot connect with Primary DNS server and asks me to "reset the network adapter Local Area Connection" and that doesn't change anything.

My PC seems to recognise that it's connected to a "network", but then has local-only connectivity.

I did the ipconfig/all mentioned in another post and got the following:

Windows IP Configuration

   Host Name . . . . . . . . . . . . : Helen-PC
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Unknown
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) 82562V-2 10/100 Network Connecti
on
   Physical Address. . . . . . . . . :
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::ace2:6e4a:8f72:7d70%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 81.104.85.181(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : 04 May 2010 12:56:06
   Lease Expires . . . . . . . . . . : 11 May 2010 12:52:09
   Default Gateway . . . . . . . . . : 81.104.85.1
   DHCP Server . . . . . . . . . . . : 10.185.16.142
   DHCPv6 IAID . . . . . . . . . . . : 251666800
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-11-0D-12-82-00-21-70-10-19-84

   DNS Servers . . . . . . . . . . . : 194.168.4.100
                                       194.168.8.100
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 6:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter
   Physical Address. . . . . . . . . :
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 7:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . :
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 12:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft 6to4 Adapter
   Physical Address. . . . . . . . . :
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2002:5168:55b5::5168:55b5(Preferred)
   Default Gateway . . . . . . . . . :
   DNS Servers . . . . . . . . . . . : 194.168.4.100
                                       194.168.8.100
   NetBIOS over Tcpip. . . . . . . . : Disabled

I would be grateful for any suggestions as I'm fairly PC literate, but not at all confident altering settings that could seriously affect how my PC works.

Thanks