#1 there is no such thing as "terminal" in Windows... That is a Mac only feature...
#2 If ANY security program came with windows, IT IS TAMPERED WITH! Just because its genuine doesn't mean its not tampered with and something was bootstrapped...
#3 Windows 7 actually comes with all the tools necessary to PREVENT anything from getting on your machine, its when you allow something to get on that you need malware protection. (when you don't read that dialoged box and select "yes", yea your letting something install something on your machine. That is the BEST form of protection anyone can offer you)
#4 I still don't know how you can say MSE uses too much CPU power... It uses EXACTLY what you tell it. You can set it at 10% or you can set it at 100%...
So in summary you seem to be 1 of 3 users, the type that is completely ill informed about Windows... The type that ask for help, but really doesn't want it and just wants to bitch about something... or just someone that is trolling.