Please navigate through these below location , manually delete the McAfee folder, which would help us to drill this down further ?
C:\Program files & common files
C:\Documents & settings\All users\Application data
Note :If you are unable to delete McAfee files , please try the same in safe mode.
Restart the computer and check if you are able to access Internet ,
McAfee Online Community Moderator
Restart the computer,as soon as u restart keep tapping the F8 key and get in to the safe mode with networking,and try wthr you are able to go online if not try to ping the website if u get error try to contact the ISP or else try with diffrent connection.