Help! I am trying to get my HTC one back to stock

[AC Question]

Hello, i was on the Cyanogenmod 11 rom on my HTC one but wanted to go back to sense. i locked my bootloader and installed the RUU and when i ran the RUU.exe i got into the program but it's stuck on checking header. Now i really need help to fix this or get back into cyanogenmod.