Please describe your issue. As far as I understand you cannot boot into Windows right?
Since I don't know the exact problem, here are some solution guesses that may help. From that command prompt you can manually repair your system with:
Repair system files:
sfc /scannow
Rebuilding the BCD
bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
Scanning your disk for problems:
chkdsk C: /f