I have the same problem, I used Hijackthis and found these and I use my ZoneLab firewall to block them from executing,
My Avast Anti-virus (BootScan),Windows defender,Ad-aware didnt detect them
O4 - HKLM\..\Run: [oemwytf] C:\Program Files\Common Files\System\uiiabxb.exe
O4 - HKLM\..\Run: [ygdjcli] C:\Program Files\Common Files\Microsoft Shared\hudkbnd.exe