In XP Trojan horse Virus problems

Two weeks ago, my computer became infected with a trojan virus.  I started having problems with hidden files to become and then has to connect to my AT & T Yahoo email account.  A tech AT & T ran a sort of diary on my computer and said that the problem was a Trojan horse.  I then reinstalled my OS (XP SP3) but soon had the same problem with the files become hidden.  These have been discovered when I ran my Avira anti-virus free progr.  Since then, I have probably reinstalled my OS 4 times more and almost immediately to have the same problem with hidden files.  When you run Avira, I would get the following error message: "one or more hidden objects that indicate a hidden virus or unwanted program found."  Because of this message, Avira would never execute the search.

In addition to Avira, I also run Windows Defender, Malware Anti-Malware and Super Anti-Virus Free Edition.  I usually run 2 of these programs every day.  When I reinstall my operating system, I always install the same software (most who are on an external hard drive) I have always used.  File types that are hidden are: Application Data models, send to, the local settings and Config.Msi.  Yesterday, I tried to show all the files I could find (this time there were about 12), but when I ran Avira I got the same error message indicating that there is more hidden files.

Read the other questions previously posted and answered about a trojan virus infect a XP system, I uninstalled Avira and installed Windows Security Essentials.  However, no threats were detected during a scan.  I also downloaded Vipre Internet Security and just now completed a deep analysis, even when no threats were detected.

I have to admit that I'm a little computer illiterate, but is there anything else I could try to fix this other than to reinstall my operating system once more?  Is there a log I could run to determine what program this is what keeps infecting my computer?  Also, should I break down and buy an anti-virus program rather than use a free?

Help! Help! Help!
Steven

A big thank you to all who gave advice.  Before I got your answers, I decided to reinstall my operating system once more as I have had problems with a program that ran for many years.  Patience isn't one of my virtues.  After reinstalling all my programs, I ran Avira and again received the following error message: "one or more hidden objects that indicate a hidden virus or unwanted program found."

Daavee mentioned in his reply that the file types, I mentioned in my original question are supposed to be hidden.  However, I wonder why Avira thinks that these hidden files are potential viruses.  Also, since I have never hidden their in the first place, how they became hidden?  I always show everybody I find, but somehow they always becomes hidden again.  What causes this?

I took the advice of AndreasAnaya and uninstalled all my programs except Defender antivirus and installed Avast.  The anti-spyware and anti-malware the same as antivirus?  I do not, but uninstalled Super Anti-Spyware and Malware Anti-Malware as Avira before installing Avast.

I just ran Avast and no virus was found.  However, he found two errors; "Has reached the end of the file."  I don't know what that means.  I tried to remove chest as instructed by Andreas but when I clicked on the chest, nothing was there.

If all goes well, by deleting my previous operating system before installing it again (as indicated by Andreas), a virus has been removed.  Once again, thank you for all the advice!  I hope that all my problems were solved!

Steven

Tags: Windows

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