Dont know if i would be using this in future or not :)

User can boot into Windows but not Mac

To backup from Mac
Go to Computer >> Select E:/ (Mac de) >> Users >> ( User de name) >> You'll see the files

To reformat Mac side using the partition inside
1. Have to connect to Internet
2. Restart press option
3. Go to Recovery Hd
4. Follow instruction (click agree or so)
5. Go to Disk Utility>> Select Macintosh (Journaled) >> Erase
All DATA will be gone  

6. At the Disk Utility Screen again, Select Reformat Disk >> Select Macintosh
7. After finish reformating.
8. Boot into Mac and Windows. See can or not
8. Update Mac OS
9. Have to download iTunes / iGarage or any other that missing from Apple.
10. Configure.