Default [Q] I need some urgent help!

I cannot get my HTC one back to stock, I've downloaded multiple RUU's, both .exe and .zip. The .exe will open on my PC, then say "Not Responding" then completely terminate the program. The .zip file says

C:\Users\home\Desktop\Fastboot>fastboot flash zip RUU.zip
sending 'zip' (1180768 KB)...
OKAY [ 42.626s]
writing 'zip'...
(bootloader) zip header checking...
(bootloader) zip info parsing...
(bootloader) Read zipped android_info fail
FAILED (remote: 99 unknown fail)
finished. total time: 42.882s

I'm running the .zip file in: fastboot oem rebootRUU
then I run : fastboot flash zip RUU.zip

I just want to get it to stock.