My iPhone is doing weird things (Error 21)?

So, my iPhone worked fine until a few days ago.
My battery was around 40-60 and I putted the phone gently into my pocket because I was going to my brothers room to game.
And when I came there, I took the phone gently out of my pocket but it was off and it wouldn't turn on.
When I putted in the charger, the iPhone logo appeared and it successfuly opened but I couldn't turn my Wi-Fi on & I couldn't listen to music also the battery seemed to be 100% but whenever I unplug it from the charger the iPhone immiaditly turned off, it only opens when I plug it in the iPhone.
First, I thought the problem was my brothers charger because I used it 4-5 times but that wasn't the problem because my brothers iPhone worked fine & also I tested it again with my own charger and I still had the same problem.
I read on the internet that it could be possibly a target of a virus in my phone also I don't think my PC is that clean because I'm sure I have something close to a virus on my PC.
So it said to hold the volume - & + button and the home button at once to put it in recovery mode or something (to delete the virus, I wanted to format it) and an iTunes logo showed up and it said your iPhone had a problem bla bla and they had to solve it, so I did it and it said error 3194 and I read on the internet that you can solve that problem by editing your hosts file, I edited it and I still have an error, error 21.
And here is my hosts file: http://shrib.com/hEeH1J06

You could save a life by helpin

Get rid of your iPhone and get a real phone.

Not a virus. Apple's rarely (if ever) get them. It's a broken or corrupted host file that needs fixing or replacement. You've done that but it doesn't mean it will not happen again when fixing Error 21. Error 21 means iPhone is not loading properly on startup. You might need to use another PC to connect to iTunes just to be sure you can reformat them correctly without issues. Best luck.

http://support.microsoft.com/.../kb/972034

http://support.apple.com/.../kb/ts4451

http://www.geekfori.com/forum/fix-error-21-when-trying-restore-iphone-4-a-108285.html

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