Check on the McAfee website whether they offer a special removal tool.
Security suites digging deep into the system sometimes need such tools to remove even the last remains of the former installation, normal deinstallation like you use to do with most software will leave traces and artifacts here and there in the registry. These could cause troubles with other security software, or in case of reinstalling the former one, it can even have a negative effect on system stability and speed, though that is not the rule.
Not all are like this, but I have strolled over some, over the years. Especially Symantech left a very very foul taste in the mouth back then. Though that was long time ago. I avoid Symantech like the plague since then.
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If you feel nuts, consult an expert.
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