Open CMD (Command line) and run the command according the product you want to uninstall
McAfee Agent 5.0.1 - 5.0.1.516
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{86D55FFD-408E-4F73-8557-157E920A6AC6}
Key: UninstallString
MsiExec.exe /X{86D55FFD-408E-4F73-8557-157E920A6AC6}
McAfee Agent 5.0.2.333
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{dea2d287-b3f7-4828-8332-3cf31ed15ed7}
Key: UninstallString
MsiExec.exe /X{dea2d287-b3f7-4828-8332-3cf31ed15ed7}
Uninstall McAfee Virus Scan 8.8 P2 - 8.8.0.975
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\McAfee\ePolicy Orchestrator\Application Plugins\VIRUSCAN8800
Uninstall Command
msiexec /x {CE15D1B6-19B6-4D4D-8F43-CF5D2C3356FF} REMOVE=ALL REBOOT=R /q
Uninstall McAfee Virus Scan 8.8 P4 - 8.8.0.1247
Key: Uninstall Command
msiexec /x {CE15D1B6-19B6-4D4D-8F43-CF5D2C3356FF} REMOVE=ALL REBOOT=R /q
Uninstall McAfee Virus Scan 8.8 P5 - 8.8.0.1385
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\McAfee\ePolicy Orchestrator\Application Plugins\VIRUSCAN8800
Key: Uninstall Command
msiexec /x {CE15D1B6-19B6-4D4D-8F43-CF5D2C3356FF} REMOVE=ALL REBOOT=R /q
McAfee Agent 5.0.1 - 5.0.1.516
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{86D55FFD-408E-4F73-8557-157E920A6AC6}
Key: UninstallString
MsiExec.exe /X{86D55FFD-408E-4F73-8557-157E920A6AC6}
McAfee Agent 5.0.2.333
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{dea2d287-b3f7-4828-8332-3cf31ed15ed7}
Key: UninstallString
MsiExec.exe /X{dea2d287-b3f7-4828-8332-3cf31ed15ed7}
Uninstall McAfee Virus Scan 8.8 P2 - 8.8.0.975
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\McAfee\ePolicy Orchestrator\Application Plugins\VIRUSCAN8800
Uninstall Command
msiexec /x {CE15D1B6-19B6-4D4D-8F43-CF5D2C3356FF} REMOVE=ALL REBOOT=R /q
Uninstall McAfee Virus Scan 8.8 P4 - 8.8.0.1247
Key: Uninstall Command
msiexec /x {CE15D1B6-19B6-4D4D-8F43-CF5D2C3356FF} REMOVE=ALL REBOOT=R /q
Uninstall McAfee Virus Scan 8.8 P5 - 8.8.0.1385
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\McAfee\ePolicy Orchestrator\Application Plugins\VIRUSCAN8800
Key: Uninstall Command
msiexec /x {CE15D1B6-19B6-4D4D-8F43-CF5D2C3356FF} REMOVE=ALL REBOOT=R /q