My Book World Edition II shutdown on startup (windows 7)

Hello lads,

It’s already some time i’m experiencing a really annoying issue. I’ve got three computers connected to this storage, and It’s working without any problems on two XP installations, but every time I start my win7 system, the external drive just freeze and i’m not able to access it even from another computer. It happens only when logging in and just in the moment I get onto my desktop. I’ve to manually restart the drive. It happens since I upgraded to new wins. I’ve not found any solutions on the internet nor here and wd support’s not available in my language so i consider it my last desperate way to get this fixed, has anyone experienced this before? I’ve already tried to install all aveilable drivers, but nothing worked.

Thank you