How to put an iphone on a new computer?

Right now my if i want to put music on my iphone I need to plug it into my laptop and download music from there. The laptop is getting really old its now 5 years old and slow and it freezes all the time. I have tried many times to get it to only work on my desktop computer. But it won't make the desktop the main computer.

I really want to switch it because everytime I plug my iphone into the laptop the laptop freezes and take 5 years to load.

I also fear that one day the laptop will die an ill be screwed.

Is there any way to change it to a different computer or do I have to buy a new iphone.
I could really care less if it deletes everything off my phone as long it gets o n a new computer.

My iPhone 5 dose not say ISO when i post picture on Facebook why?

I got a new iPhone 5 theses nothing wrong with it the software is all up to-date the only very small problem i have with it is when i post a picture on Facebook with my iPhone it dose not come up with ISO pictures on my Facebook when i post a picture it should say ISO but it don't it said just now or my lactation i think its really cool when someone post a picture on there Facebook and it comes up with ISO but, mine done seem to do this like when you use your blackberry it comes up with uploaded from blackberry when you post a picture or windows phone the little logo mine don't say it why

Will Siri come to the iPhone 4 with iOS 7?

Aight so I heard iOS 7 is supposed to release this month so like when I get that update, will my iPhone 4 have Siri or nah? Also, I heard if you jail break ya phone you can't get updates, that's true or nah?

YouTube videos are blurry on iPhone 5?

I would always watch youtube in the safari but since yesterday the "HQ" sign hasn't been showing up. (On mobile) And when I would go to youtube it would redirect me to the desktop page every single time. So with all these bugs I downloaded the YouTube app and since that doesn't have HQ all my videos are blurry. I have LTE and that wasn't working so I even tried my house Wi-Fi and still the same. I've tried restarting my pho e and closing the apps still nothing. This just a bug I have to del with? Anyone else having this problem!

Should I buy the iphone 5 right now or wait?

The iPhone 5 is currently $99.99 on sprint. Should I buy it right now, or wait for the new rumored iPhones to come out? Will the price stay the same as it is now, or will it lower even more? And yes, I'm eligible for an upgrade.

Snapchat application on iPhone

My friends send my snapchats all the time and they always send me videos while they're playing there song and I can hear what they're listening to and they have like androids I think but why can't I do the same? My snapchat is updated and every time I play a song and try to take a video on my snapchat so they can hear what I'm listening to- the song just stops and the snapchat continues to record. Does it just not work on iPhones? Cause I know it happens to my friend to and we both have the iPhone 4s

Iphone 5 search bar messages showing up?

When you go to the search bar on your iphone 5, you'll type a few key words into it, and it will bring up old messages from someone you were talking to with that key word you typed into the search bar, my question is, are those messages YOU sent to that person, or messages that were sent from that person?

IPhone won't receive pictures?

I have an iPhone 4 and when some one that has any other phone sends me a picture it won't receive it and I can't send them pictures. Also I can't send group messages at all. What's wrong?