(2 part post):
It's not clear how you transfer pictures from your digital camera to your PC. Some people connect their camera to the PC via a lead (which is slow and cumbersome). Others use a card reader (which is simpler and quicker). The advantage of a card reader is that it enables you to treat a memory card as another drive. If you've not already got a card reader, buy one. It will make it easier to transfer pictures from a memory card to your PC and, more importantly, it makes it easy to transfer pictures in the opposite direction:
http://www.ebuyer.com/product/119852
You'll also need a spare memory card:
http://www.ebuyer.com/product/83430
Plug the card reader into a USB port. Insert the memory card into the card reader. Go to 'My Computer'. Double-click. Then double-click on whatever drive letter is assigned to the relevant slot of your card reader. (It's drive G on my PC). A window will open, displaying the (non-existent) contents of the memory card. If the window takes up all, or most, of the screen, resize it so that it's smaller.