Can someone please help my iphone 4 is stuffed after ios 7.1 update?

Hi everyone I have a friend who accidentally press on the new ios 7.1 update and now my iphone 4 is stuffed up.
My list of problems are:
Home button doesn't even work it use to work fine with ios 7.0.6
The battery drains so easily
It keeps telling me to trust the computer no matter how many times I press trust (can't connect to itunes because of this)
It would screeen shot itself for no reason
The powerbutton doesn't work sometimes
My apps lag a lot or it gets stuck (have redownloaded all my apps but still it doesn't work)
Could someone please help me out. I m so disappointed with apple now and I need a way to fix my phone. I don't have money to buy another one and I m out of warranty. If someone could suggest a way it would be much aprreciated.

Lintastic wrote:
If someone could suggest a way it would be much aprreciated.
Connect to iTunes on the Computer you Usually Sync and Backup to and Restore as New
See  >  http://support.apple.com/kb/HT1414
Make sure you have the Current Version of iTunes Installed on your computer
iTunes free download from www.itunes.com/download

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