Without additional technical information all I can say is if you have any snapshots then delete them and cleanup the disk again. Also you can choose to enlarge the virtual disk or add a second virtual disk. Have a look at: Resizing a virtual disk in VMware Fusion (1020778) & 
Managing Virtual Hard Disks
Otherwise... To help figure out what is what, the best way to provide comprehensive diagnostic information is to use the "Collect Support Information" command from the VMware Fusion (menu bar)> Help > Collect Support Information and then attach the .tgz file it created on your Desktop to a reply post.