How to recover lost data from iphone 5 after I accidentaly deleted some files?

I tried everything itunes, I keep downloading softwares but you have to pay like 55 or almost 100 to get a full version and you can hardley do anything on the trials. I did download the easu us 2.0 but it was a.exe file and I downloaded the mac version. I NEED Help!

Added (1). I Already tried that one and you have to buy the actual software to do anything.

Use the following tutorial for that. It gives how to recover whatever you lost.

There's not a recycle bin on your iphone So you can't recover the files from iphone alone.
backing up you iphone on the computer on weekly basis will be somehow helpful

I did find a software that can do that, but I can't remember the name.
Just search a google and find out this article, I think you can first download the trial version, it has a little limitation, but it is useable.
http://www.ipad-video-converter.us/fonelab/how-to-recover-lost-iphone-data.html

Do not worry too much, there's big chance for you to get them back.
What you need is a professional iPhone data recovery tool.
The one I ever used to recover my iphone files called Hodo iPhone data recovery software.
You can go ahead to download one for trying. It is able to recover iPhone files in two methods: directly from iPhone & recover from iTunes backup.