computer boots fine except that when it has finished loading instead of displaying the login screen it displays the "now safe to turn off your computer" screen. numlock light behaves as normal and ctrl+alt+delete restarts machine. holding escape produces orange dots on the screen and locks the machine so that numlock stays on and ctrl+alt+delete does nothing.
machine crashed and froze while loading an application. it is possible (though not probable) that this app was writing to the registry at the time. before loading the app the machine was left connected to the internet unattendted because the monitor was being used on another machine. during this time the machine was acting as a server and behaving normally.
no bios settings have been changed recently.
can boot normally into dos and all files seem ok.
is it worth booting in safe mode and running a virus scan etc.
machine is running windows 98se.