Wireless crashes laptop, hardwired is fine.

[dcc251]

First of all; my apologies if I've got this wrong; I've also posted this in the laptops thread as I don't know where the problem might be - if double posting is not allowed, please let me know.

I have an Acer Aprire 1501LMi that runs perfectly well until I try to connect to my wireless router (Linksys WAG54G) it will then run for up to half an hour, before I get black screen shut-down. No warning, no error messages - it is NOT overheating (monitored).
I have tried everything I can think of - even installing a new hard drive, all with no cure.
I have always had a fully up-to-date firewall (on router) and anti-virus, as well as anti-spyware. Acer won't help, and I can't send the thing back, as I need it every day!
I'm running XP Home with SP2, the wireless adaptor is a broadcom 802.11g mini module (internal).
The other laptop in the house has an intel wireless adaptor, which has no problems.
I do know what I'm doing with computers on the whole, and am mystified by this.
I would be very grateful for any help or suggestions.
Thank you.

Sorry - edited here. . . .
It seems to crash whenever I try to download files, or post topics on a forum etc . . . then when I restart, it says that there's no wireless connection, and I lose either the relevant icon from my tray, the actual connection from network connections, or both!

The following is my HJT log.

Logfile of HijackThis v1.99.1
Scan saved at 13:00:13, on 28/12/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\Java\j2re1.4.2_01\bin\jusched.exe
C:\Program Files\Launch Manager\LaunchAp.exe
C:\Program Files\Launch Manager\CtrlVol.exe
C:\Program Files\Launch Manager\OSD.exe
C:\Program Files\Launch Manager\Wbutton.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe
C:\Program Files\Notebook Hardware Control\nhc.exe
C:\Program Files\Dell Photo AIO Printer 922\dlbtbmgr.exe
C:\Program Files\Dell Photo AIO Printer 922\dlbtbmon.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\Sysinfo\CyberLink\PowerDVD\PDVDServ.exe
C:\Program Files\Launch Manager\PowerKey.exe
C:\Program Files\Launch Manager\HotkeyApp.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
C:\Program Files\VIA Technologies, Inc\VIA Audio Driver Setup Program\AudioDeck\AudioDeck.exe
C:\Program Files\WIDCOMM\Bluetooth Software\bin\btwdins.exe
C:\Program Files\ewido anti-malware\ewidoctrl.exe
C:\Program Files\SMART Board Software\SMARTBoardTools.exe
C:\Program Files\ewido anti-malware\ewidoguard.exe
C:\Program Files\WIDCOMM\Bluetooth Software\BTTray.exe
C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
C:\WINDOWS\system32\LckFldService.exe
C:\Program Files\SMART Board Software\SMARTBoardService.exe
C:\Program Files\SMART Board Software\Aware.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\SMART Board Software\Marker.exe
C:\WINDOWS\system32\wuauclt.exe
C:\WINDOWS\system32\wscntfy.exe
C:\HJT\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.guardian.co.uk/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://global.acer.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: SMART Notebook Download Plugin - {67BCF957-85FC-4036-8DC4-D4D80E00A77B} - C:\Program Files\SMART Board Software\NotebookPlugin.dll
O4 - HKLM\..\Run: [ATIModeChange] Ati2mdxx.exe
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [SynTPLpr] C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\j2re1.4.2_01\bin\jusched.exe
O4 - HKLM\..\Run: [LaunchAp] C:\Program Files\Launch Manager\LaunchAp.exe
O4 - HKLM\..\Run: [CtrlVol] C:\Program Files\Launch Manager\CtrlVol.exe
O4 - HKLM\..\Run: [LMgrOSD] C:\Program Files\Launch Manager\OSD.exe
O4 - HKLM\..\Run: [Wbutton] "C:\Program Files\Launch Manager\Wbutton.exe"
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [NotebookHardwareControl] "C:\Program Files\Notebook Hardware Control\nhc.exe" -quiet
O4 - HKLM\..\Run: [Dell Photo AIO Printer 922] "C:\Program Files\Dell Photo AIO Printer 922\dlbtbmgr.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [RemoteControl] C:\Sysinfo\CyberLink\PowerDVD\PDVDServ.exe
O4 - HKLM\..\Run: [PowerKey] "C:\Program Files\Launch Manager\PowerKey.exe"
O4 - HKLM\..\Run: [LManager] C:\Program Files\Launch Manager\HotkeyApp.exe
O4 - Global Startup: AudioDeck.lnk = C:\Program Files\VIA Technologies, Inc\VIA Audio Driver Setup Program\AudioDeck\AudioDeck.exe
O4 - Global Startup: SMART Board Tools.lnk = C:\Program Files\SMART Board Software\SMARTBoardTools.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: BTTray.lnk = ?
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Send To &Bluetooth - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie_ctx.htm
O9 - Extra button: @btrez.dll,-4015 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: @btrez.dll,-4017 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsu...?1131562833541
O16 - DPF: {6E5A37BF-FD42-463A-877C-4EB7002E68AE} (Housecall ActiveX 6.5) - http://housecall65.trendmicro.com/ho...vex/hcImpl.cab
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\System32\Ati2evxx.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
O23 - Service: Bluetooth Service (btwdins) - WIDCOMM, Inc. - C:\Program Files\WIDCOMM\Bluetooth Software\bin\btwdins.exe
O23 - Service: dlbt_device - Dell - C:\WINDOWS\system32\dlbtcoms.exe
O23 - Service: ewido security suite control - ewido networks - C:\Program Files\ewido anti-malware\ewidoctrl.exe
O23 - Service: ewido security suite guard - ewido networks - C:\Program Files\ewido anti-malware\ewidoguard.exe
O23 - Service: LckFldService - Unknown owner - C:\WINDOWS\system32\LckFldService.exe
O23 - Service: SMART Board Service - SMART Technologies Inc. - C:\Program Files\SMART Board Software\SMARTBoardService.exe