The log looks clean. You should fix this entry and check that it doesn’t come back: it appears that one of the anti-malware programs you ran deleted the file, but remove the entry just to be sure.
O2 - BHO: (no name) - {A5366673-E8CA-11D3-9CD9-0090271D075B} - (no file)
I suggest you try a couple of rootkit scanners just to make sure there is no hidden malware on your computer:
http://www.f-secure.com/blacklight/
http://www.freewarefiles.com/downloads_counter.php?programid=22524
http://www.antirootkit.com/index.htm
Bear in mind that some legitimate programs have hidden processes, so check on Google or here before deleting anything.
Your system is not secure if you can’t update. Have you tried using WindizUpdate? This site may allow you to get some security updates for your computer.
http://windowsupdate.62nds.com/whyuse.php
