win7 wants to reformat my book

Hi there, I have an HP laptop ruuning win7 home premium 64 bit, I use SX virtual link 3.60 to access my book 500gb wielessly. Works good. But I just installed WD Drive manager version 2.115 and I get a balloon sayng connected to ny book but cannot see my book listed in drives. have to force a disconnect and then windows says that drives must be formatted for use in windows. My book is partitioned into 3, 2 ntfs, 1 fat32. What am I missing ? All thoughts greatly appreciated.