I have an e machine, and card just quit recognizing my camera card. Don't know if I deleted a necessary file or what..

When you put USB connection to your PC, use Explorer, or some other file manager (Total Commander, Free Commander ...) for going to your memory card (like you are going to some memory stick). Move your picture file to another folder on computer for saving. You can copy, move, delete files from your camera. It is the same as from memory stick.
On menu of camera, you must have option for deleting (or formating) camera memory. I don't like this hand removing. You have better control with computer...

Do not delete files on camera memory using the computer, this may damage the camera. Use camera own delete menu.

Deleting or formatting won't make the data in camera erased permanently. You can still recover pictures with camera format recovery software, recommended asoftech photo recovery as I used the program before, it's quite easy to use and works well for me
http://www.asoftech.com/apr/

You have to use a card reader either on your computer or an external USB card reader. Put the card in the card reader, open the recovery program, then select the drive where files are deleted, then press "Start" and wait for it to do it's magic.

Make sure the slide switch on the side of the card is unlocked. Your camera may just want you to format the card in the camera. Download any pics from it first using a card reader if necessary.

Skip this kind of transfer, save time by buying and using a card reader/writer. This way it is not necessary to have the need for any software on the computer. You can transfer any files from the card to the computer, and you can write to the card as well, if necessary. I recommend never to write to the card until you have transferred all files from the card to the hard drive. That is because by writing to the card, you may delete files.

You can often successfully recover deleted files from a PC, phone or camera memory card or USB Memory stick, it just depends on what's happened since the files were deleted.
When you delete files the data itself isn't deleted, just the index entry that says where the data for those files is located. The space containing the deleted files is also now marked as free space so it is available to the system for any new files to be written there instead. you can then download a file recovery program and use the program to scan the memory card and then recover lost pics
http://filerecoveryblog.blogspot.sg/2011/09/how-to-recover-deleted-photos-from.html

The memory cards in most cameras is removable and the pictures can be downloaded without the camera. The memory card is usually located behind a door in the camera. you release it by pressing on it or pressing a release button. notice the position of it as you remove it because you are going to want to put it back in exactly as you removed it when you are finished dowloading your pictures.

To download the pictures, you do not need any special software; but you do need to connect the card to the computer. You can buy a card reader from any computer store. It plugs into a USB port. Insert the card into the reader and then plug the reader into the USB port. Usually, after a few seconds the computer will recognize the reader and ask you what you want to do. Choose the next to last option to open and show files. My Computer (Explorer)will open and you should be able see a listing of your picture files. Using Explorer, you can copy the files to where ever you wnat to put them.

After you have copied the files to your computer, you can delete them from the card (though I wouldn't do that until you have verified that they have indeed been loded onto your computer). However, some cameras do not like it when you delete the pictures on the card by using Explorer. In that case, put the card back into the camera and using the camera tools, format the card.

If you want to see your pictures, while in Explorer (My Computer), double click on a picture file and it will open in software already on the computer.

Digital pictures are stored on SD cards as a file. These files occupy a fixed space on SD cards. Once deleted, your pictures will no longer be recognized by the digital camera, however the pictures are still there!
Take the memory card out or plug your camera into a Mac or Linux machine. If you have a Mac or Linux machine use a terminal window and look for hidden files using ls command.  This will show you the hidden files and your files should be in the .Trashes folder.  You can move them off the memory card with UNIX or Linux.

you can get back deleted pictures from memory card with photo recovery software. download the best photo recovery software from
http://www.asoftech.com/apr/

First things first: DO NOT take any more photos or videos with your digital camera (memory card) that you want to recover files from in case you may quite possibly ruin your chances of recovery.
Then here are some software programs that may help you out.
For Windows --> Data Recovery Tool
For Mac --> Mac Data Recovery
Here are the steps:
1. Connect your camera (memory card) PC or Mac which has installed the recovery program.
2. Scan for the lost files (photos, videos etc).
3. Recover them.