How to connect my iPhone 4 to a different computer?

My laptop that I would normally hook my iPhone 4 up to is currently unavailable so I want to connect my iPhone to the desktop computer that I have at my house. I downloaded iTunes and plugged in my phone, but a window popped up that said the pairing data was missing. How do I fix this problem?

IPhone app music not working

I just changed the battery in my iPhone 4 because the previous one was not working and now in just a few of my apps the music doesn't work but the sound does
e.g. In temple run you can still hear the character jumping and stuff but you can't hear any background music.

Is this because I changed the battery or what?
Thanks

Added (1). I only changed the battery because it had water damage

He's doing this? What shall I do?

Well Basically…

My boyfriend was in a car accident day before yesterday and he text me on Watsapp at night when he got back home! We had a text conversation on Watsapp (A texting app on iphone, were you can see if the persons online of offline or when he was last on) he told he's fine, has damaged his neck and lower back but is fine, back home but he needs total bed rest.

So yesterday I texted him going "Hi babes how you feeling"? At 10am… Rang him at 12pm then rang him at 6pm.

He didn't respond! Thats fine I understand what hes just been through. But what's getting to me is that since I rang him and texted him yesterday, he's been online 5-6 times!

So he has time to come online but not respond to me!

Why is he doing that!

Just shattered my iPhone, what next?

I shattered the glass on the back of my white iPhone 4. What should I do FOR THE TIME BEING? My friends suggest to place duct tape on top of the glass to seal it until I can't get it replaced.

Why does my iPhone 4S switch to 3G when I lock it?

When I lock my phone for around 5 minutes or so and then I unlock it, it will switch from Wi-Fi to 3G and then it will switch back. It's hard to explain but 3G basically turns on when I lock it. Does anyone know how to make it stop because if I leave an app open I don't want it to use up all my data.

Itunes problem not able to sync apps?

I have the latest itunes 11.0.1.In the apps section of my iphone 5 i had 90 apps but due to virus problem i had to format my computer now i shows only 5 apps on the apps section of itunes while my iphone still have have 80 apps i'm not able to sync them to the itunes apps section… Any ideas how to sync the remaining apps on itunes

How to remove the track from iphone 5 competly?

So i recently got a iphone 5, my friend told me that the guy who sold it to me has stolen it from a another dude. I wonder if there's any way to make the iphone 5 untrackable for the previous owner.