i bought a wd mybook essential to use as a back up system about a week ago. when i hooked it up, and looked up the details on the wd site, i realised i'd bought one of the ones that come without software! i'm still unsure what to do about that, but that's not my main problem at the moment. i couldn't work out how to setup a back up system (what and when) so i turned off the computer. the next day i couldn't get the computer to start up properly. i put the windows install disk in and was able to back up my files, but not reinstall (restore) windows (it would take me through the install but it wouldn't actually let me log in). then i tried unplugging the mybook and it worked! it seems the comp was trying to boot from the mybook??? can someone explain this to me so i can understand it better, and if anyone has experience regarding this particular product, what should i do now with the external hard drive?? any help is appreciated