IE and Firefox don't open! Help me!

I have IE 6 and Firefox, but since sunday (today is wednesday) I can't use them.
I click on the icons, but they simply don't open!
If I want to surf the web, I have to click on "My computer" icon and type the address. But if I click on a link that should open in a new window, it doesn't open, because then it would have to open with IE and since it's not working, the page doesn't open...
I downloaded "HijackThis" and look at what it found:

Logfile of HijackThis v1.99.0
Scan saved at 02:00:35, on 19/01/05
Platform: Windows 98 SE (Win9x 4.10.2222A)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

Running processes:
C:\WINDOWS\SYSTEM\KERNEL32.DLL
C:\WINDOWS\SYSTEM\MSGSRV32.EXE
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\WINDOWS\ptsnoop.exe
C:\ARQUIVOS DE PROGRAMAS\ALWIL SOFTWARE\AVAST4\ASHMAISV.EXE
C:\WINDOWS\LOADQM.EXE
C:\PROGRAM FILES\MSN APPS\UPDATER\01.02.3000.1001\PT-BR\MSNAPPAU.EXE
C:\PROGRAM FILES\ADMANAGER CONTROLLER\ADMANCTL.EXE
C:\TEMP\SALM.EXE
C:\PROGRAM FILES\ADMANAGER CONTROLLER\ADMANKEEP.EXE
C:\WINDOWS\SYSTEM\CTFMON.EXE
C:\ARQUIVOS DE PROGRAMAS\SVCHOST32.EXE
C:\WINDOWS\APPLICATION DATA\LUSA.EXE
C:\ARQUIVOS DE PROGRAMAS\ULEAD SYSTEMS\ULEAD PHOTO EXPRESS 2 SE\CALCHECK.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\ARQUIVOS DE PROGRAMAS\MSN MESSENGER\MSNMSGR.EXE
C:\WINDOWS\SYSTEM\DDHELP.EXE
C:\ARQUIVOS DE PROGRAMAS\MOZILLA FIREFOX\FIREFOX.EXE
C:\WINDOWS\SYSTEM\PSTORES.EXE
C:\ARQUIVOS DE PROGRAMAS\INTERNET EXPLORER\IEXPLORE.EXE
C:\UNZIPPED\HIJACKTHIS\HIJACKTHIS.EXE

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://g.msn.com.br/0SEPTBR/SAOS01
F1 - win.ini: run=hpfsched
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\ARQUIVOS DE PROGRAMAS\ADOBE\ACROBAT 5.0\READER\ACTIVEX\ACROIEHELPER.OCX
O2 - BHO: MSNToolBandBHO - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\PROGRAM FILES\MSN APPS\MSN TOOLBAR\01.02.3000.1001\PT-BR\MSNTB.DLL
O2 - BHO: ST - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - C:\PROGRAM FILES\MSN APPS\ST\01.02.3000.1002\EN-XU\STMAIN.DLL
O2 - BHO: G-Buster Browser Defense - {C41A1C0E-EA6C-11D4-B1B8-444553540000} - C:\WINDOWS\DOWNLOADED PROGRAM FILES\GBIEH.DLL
O2 - BHO: (no name) - {FFFFDA2C-A0D5-4D60-8EE1-1B7F8929E24D} - C:\ARQUIVOS DE PROGRAMAS\LYCOS\SST.DLL
O2 - BHO: ADP UrlCatcher Class - {F4E04583-354E-4076-BE7D-ED6A80FD66DA} - C:\WINDOWS\SYSTEM\MSBE.DLL
O2 - BHO: CB UrlCatcher Class - {CE188402-6EE7-4022-8868-AB25173A3E14} - C:\WINDOWS\SYSTEM\MSCB.DLL
O2 - BHO: (no name) - {00041A26-7033-432C-94C7-6371DE343822} - (no file)
O2 - BHO: BTGrabObj Class - {00000000-F09C-02B4-6EC2-AD0300000000} - C:\WINDOWS\BTGRAB.DLL
O2 - BHO: Search Relevancy - {1D7E3B41-23CE-469B-BE1B-A64B877923E1} - C:\ARQUIV~1\SEARCH~1\SEARCH~2.DLL
O3 - Toolbar: &Rádio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\SYSTEM\MSDXM.OCX
O3 - Toolbar: MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\PROGRAM FILES\MSN APPS\MSN TOOLBAR\01.02.3000.1001\PT-BR\MSNTB.DLL
O3 - Toolbar: MBKWBar - {EA5A82FB-D6BE-44F9-9363-B1ABABC153C1} - C:\ARQUIVOS DE PROGRAMAS\MBKWBAR\IETOOLBAR.DLL (file missing)
O4 - HKLM\..\Run: [ScanRegistry] C:\WINDOWS\scanregw.exe /autorun
O4 - HKLM\..\Run: [TaskMonitor] C:\WINDOWS\taskmon.exe
O4 - HKLM\..\Run: [SystemTray] SysTray.Exe
O4 - HKLM\..\Run: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\Run: [CountrySelection] pctptt.exe
O4 - HKLM\..\Run: [PTSNOOP] ptsnoop.exe
O4 - HKLM\..\Run: [ashMaiSv] C:\ARQUIV~1\ALWILS~1\AVAST4\ashmaisv.exe
O4 - HKLM\..\Run: [LoadQM] loadqm.exe
O4 - HKLM\..\Run: [PE2CKFNT SE] C:\Arquivos de programas\Ulead Systems\Ulead Photo Express 2 SE\ChkFont.exe
O4 - HKLM\..\Run: [Discador iG] "C:\ARQUIVOS DE PROGRAMAS\IGV6\DISCADOR IG.EXE" boot
O4 - HKLM\..\Run: [msnappau] "c:\program files\MSN Apps\Updater\01.02.3000.1001\pt-br\msnappau.exe"
O4 - HKLM\..\Run: [CashBack] C:\Arquivos de programas\CashBack\bin\cashback.exe
O4 - HKLM\..\Run: [EbatesMoeMoneyMaker0] "C:\ARQUIVOS DE PROGRAMAS\EBATES_MOEMONEYMAKER\EbatesMoeMoneyMaker 0.exe"
O4 - HKLM\..\Run: [Admanager Controller] C:\PROGRAM FILES\ADMANAGER CONTROLLER\ADMANCTL.EXE
O4 - HKLM\..\Run: [salm] c:\temp\salm.exe
O4 - HKLM\..\Run: [Bouncer RunStartup] C:\Arquivos de programas\Bouncer\liveupdate.exe 110
O4 - HKLM\..\RunServices: [avast!] C:\Arquivos de programas\Alwil Software\Avast4\ashServ.exe
O4 - HKLM\..\RunOnce: [Ad-aware] "C:\ARQUIVOS DE PROGRAMAS\LAVASOFT\AD-AWARE 6\AD-AWARE.EXE" "+b1"
O4 - HKCU\..\Run: [ctfmon.exe] ctfmon.exe
O4 - HKCU\..\Run: [SVCHOST32] C:\Arquivos de programas\svchost32.EXE
O4 - HKCU\..\Run: [Dtum] C:\WINDOWS\Application Data\lusa.exe
O4 - Startup: Photo Express Calendar Checker SE.lnk = C:\Arquivos de programas\Ulead Systems\Ulead Photo Express 2 SE\CalCheck.exe
O8 - Extra context menu item: E&xportar para o Microsoft Excel - res://C:\ARQUIV~1\MICROS~1\OFFICE10\EXCEL.EXE/3000
O9 - Extra button: Ebates - {6685509E-B47B-4f47-8E16-9A5F3A62F683} - file://C:\ARQUIVOS DE PROGRAMAS\EBATES_MOEMONEYMAKER\Sy350\Tp350\scri350 a.htm (file missing) (HKCU)
O12 - Plugin for .mid: C:\ARQUIV~1\INTERN~1\PLUGINS\npqtplugin.dll
O14 - IERESET.INF: SEARCH_PAGE_URL=&http://home.microsoft.com/intl/br/access/allinone.asp
O16 - DPF: {F58E1CEF-A068-4C15-BA5E-587CAF3EE8C6} (MSN Chat Control 4.5) - http://chat.msn.com/bin/msnchat45.cab
O16 - DPF: {E37CB5F0-51F5-4395-A808-5FA49E399F83} (GbPluginObj Class) - https://www14.bancobrasil.com.br/plugin/GbPluginBb.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab
O16 - DPF: {15AD4789-CDB4-47E1-A9DA-992EE8E6BAD6} - http://static.windupdates.com/cab/Cl...bridge-c18.cab
O17 - HKLM\System\CCS\Services\VxD\MSTCP: NameServer = 200.222.0.35

PLEASE HELP ME!!!!!!!!!!! WHAT SHOULD I DO?!?!?!?!
Please, please help

Thanks a lot