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Hi jenmcd ,
There is a compatibility issue between mcafee home edition and windows 7 64 bit operating system . but soon it will be fixed as mcafee is working on it .
if its windows 7 -32 bit operating system let me know What type of internet connection you have. do you have any other 3rd party antivirus security in system apart from mcafee . If so removeother ativirus softwares .
Also try running virtual technician by going to mvt.mcafee.com (dont use www or http).
thank you. i am running win 7 64 bit.