you find a batch script for doing that here: [FIXED] Random CTDs due to internet and hardware issues ( as mentioned, a old …very old… topic )
But as mentioned, for me exists just some kind of system issue if these setting is necessary. Setting of process affinity should never be necessary and these “theory” to " reserve prozessors for windows " is just a ‘theory’. What you do with these setting is simple to limit the maximal load on your CPU… windows not need two cores in full-load and so you simple cut-off these 2cores for MSFS and may be these are also these 2cores with the highest boost.