Itunes won't detect my iphone, can't sync or back up my phone

After I have upgraded my itunes, it would no longer detect my iphone4S, so i took it to the apple store to test it and it worked.. but only not with my itunes at home. The staff recommended me to reinstall itunes, i did that but it's still not working.. If i uninstall itunes a pop up box will ask me if I want to completely delete itunes but if i select that, will i lose everything on my iphone?
I dont know what to do

If itunes is comming up and saying it can't read the device because it's locked with a passcode, you may have to put your device into recovery mode first.
To put your device in recovery mode: (Following these steps will erase your device and reset everything to factory defaults)
1) press and hold the power button until you see the slide to power off option
2) swipe to power off
3) Press and hold the home button while the device is off and connect it to your computer. Continue holding the home button until you see a graphic with the iTunes logo with a picture of a USB cable below it.
4) iTunes should give you a message that it has detected a device in recovery mode. Click ok and then select Restore iPhone. iTunes will download a fresh copy of iOS and then wipe the device and restore it. Depending on the speed of your computer's internet connection this may take a while. Just leave the iphone connected to your computer until it's finished.
If itunes is not detecting it at all or is Not giving you the message that the phone is locked with a passcode, you may end up having to reinstall itunes. This seems to be a fairly common problem after the most recent itunes update (11.1.5)
If this is the case and you happen to be running a windows based computer you will have to uninstall itunes in this order from your programs and features option in control panel:
iTunes
Apple Software Update
Apple Mobile Device Support
Bonjour
Apple Application Support (iTunes 9 or later)
Then download and reinstall itunes from itunes.com try putting your device into recovery mode again and restore.
Hope this helps.
Cheers.

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