I have recently formted my window because of virus invation and i have used my OEM key twice to activate the same pc.
So my question is that how many times i will be able to uae the OEM key in that same computer?
Some people will come in here and say "3! 3 is the number!".
They are wrong. There is no real "number of times".
The only entity that knows is the activation server farm, and it will just eventually come back as "too many times".
I've never, ever seen a documented number of times for reinstall in the same system.