Does the problem machine have any issues if you remove the router from the picture? Just for testing - if you have not already - please remove the router and connect directly to the modem. Then provide a status.

Thanks!

MBAM log:

Malwarebytes' Anti-Malware 1.40
Database version: 2551
Windows 6.0.6001 Service Pack 1

8/17/2009 9:53:46 PM
mbam-log-2009-08-17 (21-53-46).txt

Scan type: Full Scan (C:\|D:\|)
Objects scanned: 227149
Time elapsed: 35 minute(s), 59 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 2
Files Infected: 2

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
C:\Program Files\Malware Professional (Rogue.MalwareProfessional) -> Quarantined and deleted successfully.
C:\Program Files\Malware Professional\logs (Rogue.MalwareProfessional) -> Quarantined and deleted successfully.

Files Infected:
C:\Program Files\Malware Professional\noadware4_021709.na (Rogue.MalwareProfessional) -> Quarantined and deleted successfully.
C:\Program Files\Malware Professional\unins000.dat (Rogue.MalwareProfessional) -> Quarantined and deleted successfully.

Hijack This log:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 9:58:10 PM, on 8/17/2009
Platform: Windows Vista SP1 (WinNT 6.00.1905)
MSIE: Internet Explorer v8.00 (8.00.6001.18813)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\system32\taskeng.exe
C:\Windows\Explorer.EXE
C:\Program Files\Windows Defender\MSASCui.exe
C:\Windows\RtHDVCpl.exe
C:\Program Files\Adobe\Reader 8.0\Reader\reader_sl.exe
C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe
C:\Program Files\Java\jre1.6.0_04\bin\jusched.exe
C:\Program Files\Napster\napster.exe
C:\Program Files\HP\HP Software Update\hpwuSchd2.exe
C:\Program Files\TomTom HOME\TomTomHOME.exe
C:\Program Files\Alltel\GoBoingo\AlltelWifi.exe
C:\Windows\System32\rundll32.exe
C:\Program Files\Windows Live\Messenger\msnmsgr.exe
C:\Program Files\BigFix\bigfix.exe
C:\Program Files\HP\Digital Imaging\bin\hpqtra08.exe
C:\Program Files\HP\Digital Imaging\bin\hpqSTE08.exe
F:\HijackThis.exe

O23 - Service: NVIDIA Display Driver Service (nvsvc) - NVIDIA Corporation - C:\Windows\system32\nvvsvc.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\CyberLink\Shared Files\RichVideo.exe
O23 - Service: XAudioService - Conexant Systems, Inc. - C:\Windows\system32\DRIVERS\xaudio.exe

--
End of file - 1342 bytes

The computer does connect without the router but IE still will not display the web page.

I am just going to reinstall Vista on the machine. I assume that will fix it.

Apologies Xaviernox,

I've been down with a bug and not on top of my posts here. Is there any other reserach I can perform for you or have you committed/resigned yourself to a reinstall?

Sorry I haven't answered sooner; try the following steps to re-set TCP/IP on the affected machine:

1. Click on Start button.
2. Type Cmd in the Start Search text box.
3. Press Ctrl-Shift-Enter on the keyboard, and click cmd.exe to run Command Prompt as Administrator. Allow the elevation request.
4. Type netsh winsock reset in the Command Prompt shell, and then press the Enter key.
5. Restart the computer.

And then, if that doesn't work, do these steps:

1. Click on Start button.
2. Type Cmd in the Start Search text box.
3. Press Ctrl-Shift-Enter on the keyboard, and click cmd.exe to run Command Prompt as Administrator. Allow the elevation request.
4. Type netsh int ip reset resetlog.txt in the Command Prompt shell, and then press the Enter key.
5. Restart the computer.