I've just installed W 7 on my PC, but still on XP on this laptop. Much prefer W7 - it is a wee bit like theMAcs now with pop up screens at the bottom so you can see what's open. How you got into a registry file goodness only knows, Kerstin! But never click yes to anything registry based, unless you are absolutely sure what it will do. They should be hidden and secure files anyway. What on earth were you doing at the time?