WD Passport Essential Crash


I have a WD passport Essential 320gb.After WD Smartware has run a while idle I get a popup box saying it has to close.Event Viewer system has a error code that states  The WD File Management Engine service terminated unexpectedly.After this Smartware will not run a backup until the computer restarts.It has Smartware version

My computer runs XP Pro.Anyone has any solutions for the error?