ho provato con la versione usb, ma ho lo stesso problema.
inserisco il log hijack per eventuali suggerimenti su conflitti possibili. Non ho aggiornato al service pack 3 perchè il pc in questione mi dava problemi, inoltre non lo uso per andare in internet e lo ritengo piuttosto al sicuro.

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 10.09.04, on 10/03/2010
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.20733)
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:\Programmi\COMODO\COMODO Internet Security\cmdagent.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\AVG\AVG9\avgchsvx.exe
C:\Programmi\AVG\AVG9\avgrsx.exe
C:\Programmi\AVG\AVG9\avgcsrvx.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\LSI SoftModem\agrsmsvc.exe
C:\Programmi\AVG\AVG9\avgwdsvc.exe
C:\Programmi\Microsoft LifeCam\MSCamS32.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Analog Devices\Core\smax4pnp.exe
C:\WINDOWS\system32\hkcmd.exe
C:\WINDOWS\system32\igfxpers.exe
C:\PROGRA~1\AVG\AVG9\avgtray.exe
C:\Programmi\ThreatFire\TFTray.exe
C:\Programmi\Java\jre6\bin\jusched.exe
C:\Programmi\COMODO\COMODO Internet Security\cfp.exe
C:\WINDOWS\system32\igfxsrvc.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Babylon\Babylon-Pro\Babylon.exe
C:\WINDOWS\vVX1000.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Windows Sidebar\sidebar.exe
C:\Programmi\ThreatFire\TFService.exe
C:\Programmi\AVG\AVG9\avgemc.exe
C:\Programmi\AVG\AVG9\avgnsx.exe
C:\Programmi\AVG\AVG9\avgcsrvx.exe
C:\Programmi\Windows Sidebar\sidebar.exe
C:\Programmi\Windows Sidebar\sidebar.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Mozilla Thunderbird\thunderbird.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Microsoft Office\OFFICE11\WINWORD.EXE
F:\HijackThis.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: WormRadar.com IESiteBlocker.NavFilter - {3CA2F312-6F6E-4B53-A66E-4E65E497C8C0} - C:\Programmi\AVG\AVG9\avgssie.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Programmi\Analog Devices\Core\smax4pnp.exe
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\system32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\system32\hkcmd.exe
O4 - HKLM\..\Run: [Persistence] C:\WINDOWS\system32\igfxpers.exe
O4 - HKLM\..\Run: [AVG9_TRAY] C:\PROGRA~1\AVG\AVG9\avgtray.exe
O4 - HKLM\..\Run: [ThreatFire] C:\Programmi\ThreatFire\TFTray.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre6\bin\jusched.exe"
O4 - HKLM\..\Run: [COMODO Internet Security] "C:\Programmi\COMODO\COMODO Internet Security\cfp.exe" -h
O4 - HKLM\..\Run: [Babylon Client] C:\Programmi\Babylon\Babylon-Pro\Babylon.exe -AutoStart
O4 - HKLM\..\Run: [LifeCam] "C:\Programmi\Microsoft LifeCam\LifeExp.exe"
O4 - HKLM\..\Run: [VX1000] C:\WINDOWS\vVX1000.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [ClamWin] "C:\Programmi\ClamWin\bin\ClamTray.exe" --logon
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Sidebar] C:\Programmi\Windows Sidebar\sidebar.exe /autoRun
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] C:\Programmi\Windows Sidebar\sidebar.exe /autoRun (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-20\..\RunOnce: [nltide_2] regsvr32 /s /n /i:U shell32 (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [nltide_2] regsvr32 /s /n /i:U shell32 (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [nltide_2] regsvr32 /s /n /i:U shell32 (User 'Default user')
O4 - Startup: TrueTransparency.lnk = C:\Programmi\TrueTransparency\TrueTransparency.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~1\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~1\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - C:\Programmi\AVG\AVG9\avgpp.dll
O20 - AppInit_DLLs: C:\WINDOWS\system32\guard32.dll
O20 - Winlogon Notify: avgrsstarter - C:\WINDOWS\SYSTEM32\avgrsstx.dll
O23 - Service: Agere Modem Call Progress Audio (AgereModemAudio) - Agere Systems - C:\Programmi\LSI SoftModem\agrsmsvc.exe
O23 - Service: AVG Free E-mail Scanner (avg9emc) - AVG Technologies CZ, s.r.o. - C:\Programmi\AVG\AVG9\avgemc.exe
O23 - Service: AVG Free WatchDog (avg9wd) - AVG Technologies CZ, s.r.o. - C:\Programmi\AVG\AVG9\avgwdsvc.exe
O23 - Service: COMODO Internet Security Helper Service (cmdAgent) - COMODO - C:\Programmi\COMODO\COMODO Internet Security\cmdagent.exe
O23 - Service: ThreatFire - PC Tools - C:\Programmi\ThreatFire\TFService.exe

--
End of file - 6221 bytes

Ciao,

proverò il programma. Con utilizzare una rete cosa intendi? Rete internet o locale con altri computer?

In ogni caso ho provato, come suggeritomi, ad avviare scribus da chiavetta su altro computer: il problema non sussiste. Deve essere un conflitto di qualche tipo purtroppo.