Trouble doing a remote virus cleanup

I got online with a distant customer, with them saying they were getting "weird stuff" on one XP computer.  The first thing I saw was "Personal Antivirus" giving some "infected" messages.  They assure me they never installed that, and, guessing it might be bogus, I removed that from the startup in msconfig.

Next, I transferred the spybot installation program from my computer to theirs, but after I installed it, it failed when it got to the point where it requires that it needs to be able to download updates, and thus made me cancel the install.  So, I had them go into safe mode with networking so they could go through the full install, and it did finish.  Then they rebooted into normal XP, but spybot would not run.  In task manager it would show that it was running--repeatedly if they tried to run it more than once--but it never would "run" on the screen like normal.

So, then I transferred the install for Malwarebytes and tried to install that one, but it would never even run the install.

I'm wondering if this might be that virus from not too long ago that prevents the user from connecting with helpful sites (such as Norton, Trend Micro, etc.), because I did notice that their AVG free edition has a warning that "the connection failed" for the update manager component.  Yet they do have some internet connectivity, evidenced by the fact that I'm still able to access the computer remotely.  However, just now I tried to get on some generic sites (like google, etc.) and noticed that it will no longer connect to any site, and as it is trying to connect, it shows the word "Blocked" for a few moments in the upper left area of the screen.

Finally, I ran a full scan using their resident free AVG Antivirus, and it found these two problems in the \Temporary Internet Files\ area:
Trojan horse Rootkit-Agent.EA

AVG is still running, but I'm assuming that AVG alone is not going to be able completely "fix" my problems once it is finished.

So is there some good software I can use to solve their problems?  Since their IE will no longer let me go to any page, I'm wondering if there is a product that I can download to my computer, then transfer the installation .exe to their computer---and expect it to run correctly (unlike spybot or malwarebytes).  

Any suggestions on what I can do to help them from a distance will be appreciated!  TIA

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Have Þhe download and run combofix from Should be a good first step....

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If you use Combofix, please read and forward the directions to the end user.
(The directions are located at the URL that John provided,
You should rename Combofix PRIOR to it being downloaded on the system as some malware/viruses prevent it from running under its default name.
This may also be the problem with Malwarebytes and AVG.
Once Combofix is renamed and downloaded run per directions.
You may also want to check the host file. It may have been altered.
There is a script to fix faulty connections. The script reinstalls the Winsock, TCP/IP stack, and HOSTS file.
The file is small enough that the end user could download it to a thumb drive or it could be sent via email. If you send it via email, please rename the .zip to something like .123 as some email programs will strip the attachment if it detects an extension such as .zip

Tony GiangrecoCommented:
Performing this process in safemode may not be possible, but here is what I suggest. It has worked for me before:

Restart into safe mode and run your anti virus and spyware detection programs. I suggest running this series in three back to back cycles, rebooting once per cycle back into safe mode:
1, Malwarebytes
2. SuperAntiSpyware
3. Spybot
4. Download and install the trial version of Symantec Endpoint

After three complete cycles, reboot into normal mode. If the situation continues, go to TrendMicro and run the online scan Housecall
ComboFix would be very effective against such a problem. Another alternative is this:

Download the ISO file from the above link and burn it as an image on a CD. Then boot your PC from it and let it scan your PC completely for viruses. After this scan is done, then reboot your PC in normal mode and install MalwareBytes and then scan with that.

Hope it helps.
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