ITunes problem 64-bit downloading?

I recently downloaded iTunes 64-bit (I'm certain it is 64 bit), and the download is successful. So when I open up iTunes, I connect my iPhone 5c to my computer. The second I connect my iPhone, a popup on iTunes says:
"This iPhone can't be used because the required software is not installed. Run the iTunes installer to remove iTunes, then install the 64-bit version of iTunes."
I know for sure I have downloaded/installed the 64-bit version?

What should I do with an extra iPhone?

So, I have an iPhone already, a 5C, and an iPod touch. I found an extra phone of my sister's in a drawer, and since nobody else seemed to want it, I automatically took it. However, I use my own iPhone for videos and music and my iPod for iFunny and pictures- so I have no clue what to use this new one for. I also have an iPad, and I use that for gaming and the sort. What should I use this extra one for?

IPhone 4 is showing bars of colors?

My sister had made me drop my iPhone 4 and when I turn it on the phone shows nothing but colorful bars show up. I can vaguely make out my background, and I can still get into my phone but it is nearly impossible to see anything. I can access my Instagram, Snapchat, etc and the camera works absolutely fine and so do the pictures. I have tried restarting it and shutting it off, a detailed explanation would be appreciated As soon as possible

Why is my video quality bad?

I recorded a video with my front camera (iPhone 5s) which is pretty good quality, on Final Cut Pro x I shared via Youtube settings, straight to my channel. 720p, 700mbs, when I view the video, its kinda blurry, why is this? How do I fix it

Cheap unlimited internet for home?

Is there any cheap internet for home? I want unlimited internet because we use 2 computers and 1 Iphone and we use them a lot everyday. So what's the best unlimited internet where you don't pay more than 50 dollars a month?

Wi-Fi and Bluetooth greyed out after water damage on iPhone 5S?

I dropped my iPhone 5S in water. I didn't have anything to dry it with, but a towel. I tried to turn it off, but it turned itself on again. Now my Wi-Fi is greyed out, and Bluetooth is constantly circling. I haven't backed it up for a long time. And I'm on vacation without any computer.

Is the sun stone calendar Mayan or Aztec?

I can't find a straight answer to this online. Is this sun calendar originally Mayan or Aztec? I know the Aztecs adopted and/or improved the Mayan calendar, but did the original Mayan version include the sun god in the middle?

Calling/texting my travel partner while abroad?

I'm traveling with my boyfriend to Europe. We want to be able to text or call each other if we accidentally get separated. I'm not concerned about the monetary rate - I just want to know if it'll work. I've heard you need to get international activation (get it "unlocked") to even use your phone while abroad, is that true? That's what I'm concerned about.

Do you also need international activation to access the internet from your phone? (I know the data is expensive without a plan but will it still work?)

If it matters, we both have iPhone 5 and we're together on the same AT&T plan. We'll be in France, Italy, and Switzerland.

If this is something we need to get done, do we go to the Apple store, or to AT&T for it?