It's a little difficult to follow what you're saying, so I'll just state the wisest choice.
If you feel someone is using your "username" in a chat site, log in and immediately change your password. Also report the issue to the boards Admin (or support area)
Note: a nickname is not a username, so there may be some confusion here.
These are the information from hijack:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 9:41:04 PM, on 7/13/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16674)
Boot mode: Normal
Running processes:
C:\WINDOWS\System32\smss.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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0\avp.exe
C:\WINDOWS\system32\rserver30\RServer3.exe
C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0\avp.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Program Files\BrushGroup\FS WebSearch 5\ws.exe
C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\rserver30\FamItrfc.Exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe
R3 - URLSearchHook: (no name) - {34ea1c70-42cc-42c5-aa29-ec58b95a343e} - (no file)
O2 - BHO: (no name) - {34ea1c70-42cc-42c5-aa29-ec58b95a343e} - (no file)
O3 - Toolbar: (no name) - {34ea1c70-42cc-42c5-aa29-ec58b95a343e} - (no file)
O4 - HKLM\..\Run: [kav] "C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0\avp.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [FSWSDesktop] "C:\Program Files\BrushGroup\FS WebSearch 5\ws.exe" desktop
O8 - Extra context menu item: Translate with &Babylon - res://C:\Program Files\Babylon\Babylon-Pro\Utils\BabylonIEPI.dll/Translate.htm
O17 - HKLM\System\CCS\Services\Tcpip\..\{6E277086-5A0E-4366-B1CF-C189A5457B33}: NameServer = 213.163.97.5 213.163.97.10
O23 - Service: Kaspersky Anti-Virus 6.0 (AVP) - Kaspersky Lab - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0\avp.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Radmin Server V3 (RServer3) - Famatech International Corp. - C:\WINDOWS\system32\rserver30\RServer3.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
--
End of file - 2556 bytes
Do i have to Fix checked?! Apart of that My Internet sometimes is too slow?! Pliz, give em an suggestion what to do!