I checked everything.The temperature is okay (about 38°),my computer has over the recommended congig.Thinking it might be my processor,i bought a new one.A double Core 4400+ it didn't change anything.
For the -nomap it is already on because a use a mod.The original game without -nomap does exactly the same thing.
I noticed that some of my game freezed about 30sec with the sound looping and then continued again.
i tried waiting about 15min,it didn't start again.I tried to alt tab back to desktop didn't work.I had to do a reset.
I tried installing the demo of Arma to see if it would do it do it.The demo worked fine.
If I really can't find a solution I guess i will have to buy Arma.