Try this.
goto windows/system32
then type in "diskpart"
Diskpart> select disk 0
Disk 0 is now the selected disk.
Diskpart> select partition 1
Partition 1 is now the selected partition.
Diskpart> active
From what i read, I think this may help.
Here is the link i found it.
http://support.microsoft.com/default...;en-us;Q300415
Let me know how it turns out. GOOD LUCK