Ios 8 software download problem?

I have an ios8 download problem, so i've attempted to download ios8 on my iphone and its switched itself of and back on and on the screen its displayed i tunes so i've just realised you need to download it through itunes but i don't have an i tunes account on my computer. I've tried downloading itunes but my computer software dosent support it. Does anyone know how to slove this problem as my phone isn't turning on without my download of ios 8. Thanks for any help given x

Added (1). i tried to restart it but no luck unfortunately

Restart it

Smash your iPhone with a rolling pin and get Android.

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