Sorry I can't read Spanish but isn't that saying that McAfee can't remove generic.dx!woc trojan?
Here's what their website says about it.
2.Update to current engine and DAT files for detection and removal.
3.Run a complete system scan. Try running the scan in Safe Mode. (Tap F8 repeatedly while booting up. Go to Computer/My Computer (XP), right-click the hard drive and select 'Scan'.)
Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).
General repair may be unsuccessful in some instances. If this occurs, please submit a sample for further evaluation.
What is your operating system and service pack and are you up to date?