I don't have an answer for the ewido crashing at the moment (can you give us any more details?), but I do have a question: why are there new program entries in your latest HijackThis log? :
O4 - HKLM\..\Run: [Mercora] "C:\Program Files\Mercora\MercoraClient.exe" -startup
O4 - HKLM\..\Run: [VGAUtil] C:\Program Files\GigaByte\VGA Utility Manager\G-VGA.exe
O4 - HKCU\..\Run: [µTorrent] "C:\DOCUMENTS AND SETTINGS\USER\MY DOCUMENTS\My Downloads\utorrent.exe"
O4 - HKCU\..\Run: [googletalk] "C:\Program Files\Google\Google Talk\googletalk.exe" /autostart
Please don't install anything during our troubleshooting; it just confuses and complicates things.
I'm logging off for the night right now; I'll check back on this thread tomorrow...