How to get my iPhone apps to open?

I got an iPhone 3G from my uncle a little while ago, and I'm having a problem with the apps. They begin to load for about a second but then return to the home screen. I understand how for some of them, it's because they are for software higher than iOS 4.2.1 but others are compatible but still won't open. Any help appreciated.

IPhone 4S can't connect to Wi-Fi?

So this morning my iPhone 4S on iOS 6.0.1 said "unable to join the network ".It can see the network available, but when I try to actually connect, it gives me that message. I don't get it, my iPhone was working perfectly fine with the Wi-Fi yesterday, and my computer still works perfectly with it right now, so the only possible problem here is my iPhone, but I can't find out what exactly to do. Can anyone tell me what I can do to get my iPhone to work with the Wi-Fi again?

IPhone 5 touch screen issue?

I just got an iPhone 5 and I have been using it a bit when I noticed how bad was the touch responsiveness I have to press the space bar at least 2 times and when IIm scrolling as well do you think it is just a software issue a bug or a real hardware issue I'm not the only one complaining about that

Charger not supported bad for iphone?

I got a new iphone the other day and I went to plug it in the car audio thing and it gave me this message "charger not supported". I'm not trying to charge it, I simply want to play music in my car from my phone, but I don't know if leaving it plugged in will hurt the battery or anything. I've found some stuff online about how the phone won't allow the current to charge the battery when it detects a certain form of power, but I don't want to take any chances. Will it hurt my new iphone?

Problems downloading itunes to windows 8?

Hi, I bought a new Sony Vaio last night and I have since been trying to download itunes, but when I hit the "download" button on the website, no dialog box pops up. I have downloaded chrome and flashplayer and their dialog boxes have popped up because I have successfully installed both. Please help, I have an iphone and itunes is a complete necessity.