[UK-CONTEST] Internet Access - Off topic

[G3SJJ]

Need some help from the networking gurus, please. Our two computers 
worked well up until Sunday morning. Now I cannot access the internet on 
one of them, despite checking all settings and re-establishing network 
and internet connections. Both run XP and are connected through a 
Netgear wireless router.

Computer 1 - has direct broadband access through a modem. All internet 
facilities are working and full network established. Printer and shared 
files on Computer 2 all available. Pinging works both ways.

Computer 2 - accesses internet through C1. This has work solidly up 
until now. I wasn't aware I changed anything on Saturday evening / 
Sunday morning.
Now, networking works solidly but no internet access. I reverted to 
Ethernet networking using the cable that was installed before the 
wireless router. Again, networking solid but no internet access on C2. 
Then I re-installed the wifi system and again everything ok except 
internet access on C2.

I had a long telephone discussion with G7TAJ, (G3SVL's son) who works in 
networking and who kindly went through all the possible IP etc settings, 
yet it still won't work We are both puzzled.

Any help would be appreciated.

Chris G3SJJ