You realize that Threatfire is reporting system activity, here, there is nothing to indicate that the activity is suspicious.
Why do you think it is suspicious?
I suggest you download MBAM and install it, update it, and run a scan.
This is a very good demand scanner (resident in the paid-for version) that might well find and remove the trojan.
A scan report would be good to see, afterwards.
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 02:17:06, on 9/7/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.5730.0011)
Boot mode: Normal
Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\Arquivos de programas\Alwil Software\Avast4\aswUpdSv.exe
C:\Arquivos de programas\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\igfxsrvc.exe
C:\WINDOWS\system32\hkcmd.exe
C:\WINDOWS\system32\igfxpers.exe
C:\WINDOWS\RTHDCPL.EXE
C:\ARQUIV~1\ALWILS~1\Avast4\ashDisp.exe
C:\Arquivos de programas\Java\jre6\bin\jusched.exe
C:\Arquivos de programas\Adobe\Reader 9.0\Reader\Reader_sl.exe
C:\Arquivos de programas\ThreatFire\TFTray.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Arquivos de programas\Java\jre6\bin\jqs.exe
C:\WINDOWS\system32\slserv.exe
C:\Arquivos de programas\Spyware Terminator\sp_rsser.exe
C:\Arquivos de programas\ThreatFire\TFService.exe
C:\Arquivos de programas\Alwil Software\Avast4\ashMaiSv.exe
C:\Arquivos de programas\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe
C:\Arquivos de programas\Discador itelefonica\DiscadorCompitelefonica.exe
C:\WINDOWS\system32\slrundll.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Documents and Settings\Usuario\Desktop\HijackThis.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe
(1) Firewall
You are either using Windows XP Firewall or none at all… XP’s firewall does not have Outbound protection… Enhance your protection by installing a firewall with Outbound Protection… Examples are: PCTools, Agnitum Outpost, Online Armor
(2) Keys
C:\Arquivos de programas\Discador itelefonica\DiscadorCompitelefonica.exe
-= I cannot assure the harmlessness of this one… You may try sending DiscadorCompitelefonica.exe to VirusTotal… Reference
O17 - HKLM\System\CCS\Services\Tcpip..{925148F4-231D-4E87-8124-05E90B5172A6}: NameServer = 200.204.0.138 200.204.0.10
-= Do you know this IP/domain…? If not, or it suddenly appeared, consider fixing it…