what format did you use to put ME on? FAT32 or FAT16 etc?
did you use the windows installer format or a third party/manufacturer's app?
If you still run into troubles geting the full size, format one partition 20GB-30GB for windows, and the rest to keep your data in (leave it unformat untill you up winxp so you get ntfs support)
remember that the partitioning software when you format is in MB, so 1GB = 1024MB