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Apologies for the delay in you receiving a reply, can you provide some basic information about your computer such as what operating system you are using** + any other security software/anti virus protection measure/s that you have in place, this to see if there could be possible software conflicts that may have left your computer unprotected, if this is the case at all you may need the assistance of the GTG malware staff.
If you have not read the McAfee tutorial that deals with such issues please see here
** Windows 8 and 8.1 for example have an updated version of Windows Defender which offers the same real time protection as Microsoft Security Essentials, if a third party AV is installed Defender is disabled by default to avoid conflicts and likewise if the third party AV becomes disabled/uninstalled Defender should be re-enabled by default, the latter does need to be checked and confirmed though as there are instances when Defender has not been re-enabled for one reason or another, one such case is when a third party AV has not been uninstalled correctly using a removal tool such as is provided by AVG for example, this leaves orphan files behind which can be detected by Defender which may see it/them as full AV protection thus leaving your computer unprotected.