My Book Essential 3.0 driver not working in Windows 7 but OK in Windows XP

I removed the drivers, rebooted and reconnected. No use. It installs again the WD Mybook 1130 and the WD SES Device, and the disk is still raw, windows asks to format. I unplug it, plug it into my XP, and voilá… all files are there.

I don’t want to reformat the drive, there is a lot of data. Do you think Windows 7 formatation is different from XP?