when trying to remove the previously installed (but not supported) FEP 2010 on windows 8 you are prompted with an error …

therefore .. here are the steps to uninstall it …

by default  the 64-bit version is installed to c:\Program Files\Microsoft Security Client\ … therein you will find the “setup.exe” … rightclick it and change the compatibilty to “Windows 7” an close the window with “OK” …

now run the following command by simply entering it into the start screen search bar and accept it with return …

"c:\Program Files\Microsoft Security Client\setup.exe" /x

this will initiate the uninstall process …

you may now install FEP 2010 with update rollup 1