Thank you for your answer Khadijah, but I'm afraid you too have to really read my post... 'cause I've written I've just formatted No problem at all, it was only a test machine. Actually, the problem isn't to format or to not format, I repeat, It was only a test machine, the real problem (not a problem but a bug found in a, I know, Beta-Testing session) is that MBARW quarantined an important windows system file and the service related in a clean system!! Is it clear???.. quarantine/restore/reboot/format... is only a way to talk about other (unreal) problem. Mine was only a feedback and not a reproach for the destiny of my poor "test machine": I said "ehi... there is a big problem" not "ehi guys, you broke my pc!!!" I hope it's clear now. Thank You all Alessandro