Another thing to try (your hijack log looked OK BTW), is try disabling some of the software you have running, such as Ventrilo and Sisoft sandra and freeRAM for example.
Also try disabling this (taken from hijack log):
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - http://a840.g.akamai...all/xscan53.cab
You can get rid of it using hijack this, and if it doesn't help or you need it, just select 'view backups' in hijack & restore the registry entry.