Before we make changes, can you post
1. The year/model of your Mac.
2. The version of Windows.
3. From the OS X side, can you right-click on "Shared" and post the format of the partition. You can also do the same thing from Terminal using the following command...
diskutil info disk0s4
Device Identifier: disk0s4
Device Node: /dev/disk0s4
Whole: No
Part of Whole: disk0
Device / Media Name: BOOTCAMP
Volume Name: BOOTCAMP
Mounted: Yes
Mount Point: /Volumes/BOOTCAMP
File System Personality: NTFS
Type (Bundle): ntfs
Name (User Visible): Windows NT File System (NTFS)
Partition Type: Microsoft Basic Data
OS Can Be Installed: No
Media Type: Generic
Protocol: SATA
SMART Status: Verified
Volume UUID: EF4FB7C0-6691-434D-B078-F4E788D9A87F
Disk / Partition UUID: A4730D2E-EDAC-4C35-B202-798A5C1361C8
Total Size: 127.0 GB (126999330816 Bytes) (exactly 248045568 512-Byte-Units)
Volume Free Space: 73.3 GB (73254535168 Bytes) (exactly 143075264 512-Byte-Units)
Device Block Size: 512 Bytes
Allocation Block Size: 4096 Bytes
Read-Only Media: No
Read-Only Volume: Yes
Device Location: Internal
Removable Media: No
Solid State: Yes