i can find the save, when i go to "%appdata% - .minecraft - "saves" then right click and go to properties then "previous saves" but when i drag it over to my "minecraft saves" it dont seem to work, i also have a back up but that wont work either, it just wont go into the minecraft "saves" folder.
There's a work around for this. The deleted world is always in saves, no matter what. So copy the folder and name it this:
Then drag it into saves. It should work. I don't know about hardcore worlds, I wouldn't try to reload hardcore worlds. It's been a long time since I reloaded my favorite world. But there is an updated version of the tutorial, try watching that before you try my idea.
In windows when you "delete" files they are simply removed from the Master File Table. Initially all of the data is still there on the drive even though you can't see it. The problem is now as far as windows is concerned that space is free and can be written over, by anything at any time! Even if it has only been minutes or hours, deleted file data could already be written over and nearly un-recoverable.
If you aren't prepared and accidentally delete something, the best thing to do is immediately shut the computer down until you have everything you need to get the files back. It's best to do recovery with the drive in another computer in read only mode or boot from a livecd, but sometimes you just gotta make lemonade.
treeco123 suggested Recuva and I heartily agree. It is the easiest tool to use to recover lost data in windows. More or less just click scan, wait, peruse results.
In addition is PC Inspector Recovery. The UI is awful but it's very powerful. This can take a very long time to run.
Lastly you can fire up something like Knoppix or Backtrack 5 R4 (both linux livecd's) and use a tool called dd_rescue. It's a lot of tricky command line work and there are a lot of great tutorials already out there, so I won't get into it, other than to say it will get the job done.
It's a huge bummer to lose files and the real tragedy is that it never has to happen. Windows has decent tools to do scheduled automatic backups or you can manually back up your whole .minecraft folder to a usb stick every time you play. You can even use Dropbox or Google Drive so you can access your minecraft backups on any computer.
I found a simple way to do it, right-click on the 'saves' file in .minecraft and click properties. Then click the 'previous versions' option, and it pulls up previous versions of the file itself, with the things in it before any change was made. It has a list of each different version made for when something big like a world deletion happened. I recovered a world like this, quick and simple.