I am unable to update Mcafee security centre as the download stops with a message "This program is blocked by group policy. For more information contact your system administrator." It also states that my PC is infected and directs me to Microsoft site for anti virus purchase. If anyone knows how to overcome this I will be immensely grateful.
Logged in as admin or guest?
Is this Mcafee home or corporate?
The initial message sounds as if your group policy forbids your account updating the virus protection.
The virus message is different so can you post a pic of the message please.
To check best run stinger
getsusp (add your email addy to the preferences)
malwarebytes and see if they find anything.
Get them here