Thanks Technical and Eddy about welcome message !
It´s very hard to explain this proplem in English but I try again. Finnish is my languade
My computer physical memory "falls down" none "breakes down" like I said earlier
My computer stop working by saying:
"starting physical memory formatting..."
but nothings happen. Only thing what I can do at then it was shutting down my computer and re-starting.
Few days ago I unnistall Avast 4.5 program and my computer act as normal. Yesterday I install Avast again and everyhing was fine untill today
I don´t know how much memory Avast is taking but I thought that 256 MB is enough.
Is it possible that "checking memory and starting files " would do this proplem ?