If I understood correctly you performed 2 scans and successfully quarantine the items but I'd like to know if they are viruses, ad-aware, malware, trojans..?
Do you have the latest DAT file running in McAfee?
What OS are you using? (Windows XP, Vista, Seven)
What version of McAfee you have? (2008, 2009, 2010)
I know that maybe it is not well seen to tell you to download and install the latest Malwarebyte's Anti-Malware version from: http://www.malwarebytes.org/ and perform a full scan, in a McAfee forum, but I would if I have a problem that must be solved ASAP.
Tell me what happens.