All I can think of is to un- and re-partition the disk. Windows installation isn't the brightest star, I would suggest
GParted,
http://gparted.org/ or
AOMEI
http://www.aomeitech.com/
Both work via BIOS = you need to burn a CD or DVD, and boot through them = press Delete or F8 at startup, it varies a bit with Motherboard, and may require a few tries = restarts, as it all goes very fast. At POST = the white letters at start, you should see the message with options, and you can press Pause to halt it, to clearly find out about it, then press Esc to continue.
There is a slight possibility to recover data, viz. by AOMEI, but it's quite hypothetical.
Most probably you need to un-partition everything, then re-partition. To quote myself again, it's a wise move to have Windows [and crucial programs] installed in C, but to have your personal stuff in another partition, preferably another disk. That way, you won't loose your personals when re-installing Windows.
Sorry if this sounds harsh, but it's the best I can do. Honesty, you know?