Internet sharing suddenly not working, PC related problem

Here's the scenario. My Mac-Mini, using 10.7.4, is sharing its Wi-fi connection to my airport extreme base station through a hard-wired ethernet connection with a PC. So the mac is tethered via ethernet cable to the PC, so it can share its wifi connection to my AEBN. This arrangement has been working fine for over a year now.
Today I updated the PC's (running XP SP3)  browser from IE7 to IE8 so I could use some web based work related sites. But now I can't connect to the internet on the PC. The PC confirms it has a network connection, and it sending and receiving packets of data, but if you open a browser, any browser, it can't load or do any business whatsoever.
What I've checked: Nothing on the mac's system prefs have changed. The mac works on the internet just fine. I've run through the PC's network connection wizzard 3 times already, no joy on the browser, but the Mac is capable of seeing shared files on the PC. The PC firewall is off. I don't know what to do or who to talk to. I realize this probably isn't the place to seek help as I think its a Windows XP issue but I'm a Mac user and the connection is shared (because the PC has no wifi card) so its in a gray area.

Hey i also had this problem, i hard reset my device & it gone but soon came back the troubleshoot says DNS server isn't responding but i fix this by the help of my experience. It will also help U all. ••-:OLUTION::-••
First connect your lumia 800 to your pc the pc will show no internet access but don't worry this all IS BECAUSE OF A SETTINGS FAULT IN THE WINDOWS .Fix :- open network & sharing centre right click ur device name (ssid) then click on properties(status) then a dialog box will open click on device properties open second tab in which select your
security ->WPA2-Personal
encryption type -> (don't change it)
Pin -> (type your pin)
Then press ok ,after this wait 1min if problem not solved reconnect your device.

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    Help Tahlia wrote:
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    <edited by host>

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    Message was edited by: turcott

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