Windows partition corrupt or unbootable after Yosemite upgrade

My windows bootcamp partition no longer shows up as an option to boot to when hitting "alt/option" while starting.

Reads in disk utility as "disk0s4" and says can't repair disk. How do I recover or backup files?

Last login: Sun Jul 12 15:04:51 on console

tests-MacBook-Pro:~ johntcreedonjr1$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *320.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 135.1 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 159.7 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *134.8 GB disk1

Logical Volume on disk0s2

0EB5178D-45CE-4F4C-B367-86A984984B26

Unencrypted

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: Apple_partition_scheme *16.8 MB disk2

1: Apple_partition_map 32.3 KB disk2s1

2: Apple_HFS Flash Player 16.8 MB disk2s2

tests-MacBook-Pro:~ johntcreedonjr1$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group A976A795-6083-435C-9497-53BD967AAE54

=========================================================

Name: Macintosh HD

Status: Online

Size: 135135137792 B (135.1 GB)

Free Space: 18911232 B (18.9 MB)

|

+-< Physical Volume CF9A9FD2-9DA9-49B2-9467-EB4F541DA9E6

| ----------------------------------------------------

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 135135137792 B (135.1 GB)

|

+-> Logical Volume Family 27AB8FB5-EA5B-41E9-8703-42FFC7B025BD

----------------------------------------------------------

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume 0EB5178D-45CE-4F4C-B367-86A984984B26

---------------------------------------------------

Disk: disk1

Status: Online

Size (Total): 134763905024 B (134.8 GB)

Conversion Progress: -none-

Revertible: Yes (no decryption required)

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

tests-MacBook-Pro:~ johntcreedonjr1$ sudo gpt -w -r show /dev/disk0

When I tried the sudo commands, I entered the only password I recall having on this computer and it didn't work. Any idea how I can figure that out as well? My apologies, as I'm out of my element and don't really have any idea what I am doing here.