Computer Problems?

I run a biostar NF4ULA9

AMD Athlon 64 3000+

Nvidia Geforce 6600 Gt

1 gig of ram (2 GeIL 512's)

get lots of BSOD's whenever i go on internet or Download

HJT Log: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:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr....

C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc....

C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.ex...

C:\Program Files\Yahoo!\Antivirus\ISafe.exe

C:\WINDOWS\system32\CTSvcCDA.EXE

C:\WINDOWS\System32\svchost.exe

C:\WINDOWS\system32\nvsvc32.exe

C:\WINDOWS\system32\svchost.exe

C:\Program Files\Yahoo!\Antivirus\VetMsg.exe

C:\WINDOWS\system32\MsPMSPSv.exe

C:\WINDOWS\system32\wscntfy.exe

C:\Program Files\Browser Mouse\mouse32a.exe

C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe

C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe

C:\Program Files\DAEMON Tools\daemon.exe

C:\Program Files\Muiltmedia keyboard utility\1.1\KbdAp32A.exe

C:\Program Files\Zune\ZuneLauncher.exe

C:\PROGRA~1\Yahoo!\browser\ybrwicon.ex...

C:\PROGRA~1\Yahoo!\YOP\yop.exe

C:\WINDOWS\SOUNDMAN.EXE

C:\Program Files\Yahoo!\Antivirus\CAVTray.exe