|Seeing as you may have spent $ome buck$ for McAfee, you may be reluctant (for now) to replace it. However, when McAfee found that Adware-OneStep.f, it most likely showed you what file was involved, and its location.|
Knowing that detail is key to resolving your problem, as other AV programs may also be "unable to delete" it... but there are other methods. Even if you have to re-scan, get that info, and write it down! Then post back to this thread.