Some nasties can hide from the Hijackthis scan.
You can fix these entries.
O2 - BHO: (no name) - {02478D38-C3F9-4efb-9B51-7695ECA05670} - (no file)
O15 - Trusted Zone: http://*.trymedia.com (HKLM)
ComboFix had also taken care of the patched driver and also deleted some files, how is the system going?