While enjoying the user experience of McAfee installation’s adequate protection against most forms of malware, your experience from the installation of certain programs or detect false positives against applications that you already trust may interrupt too.

Once, I was trying to disable a McAfee Real-Time Protection service, but when I go into Services/Properties and try to set it to Manual or Disable, it said unable to open service McShield for writing on Local Computer. Error 5. Access is denied.

I've tried logging in as an Admin, to no avail. I've tried resetting permissions in the registry to the key where the McAfee service is described...nothing helped. Logging in with Safe Mode did not help either. How can I disable this service? Is there a way to disable a service before even getting into Windows? My friend told me that he knows the method to disable Mcafee Firewall.

He said that you can manually turn off both McAfee’s Real-Time Scanning and Firewall features rather than deleting the entire McAfee application from your computer. When turning off McAfee, either configure the Real-Time Scanning and Firewall features to reactivate after a set amount of time or have them turned off indefinitely.

Disable the option Prevent McAfee services from being stopped (for stand alone installations of VSE 8.5i or later)

1.  Start > Programs > McAfee > VirusScan Console.

2.  Right-click Access Protection and select Properties.

3.  Deselect Prevent McAfee services from being stopped.

4.  Click Apply.

5.  Close the VirusScan Console.