Open MY COMPUTER - it may be on your desktop, or it will be in the Start Menu
You should see your hard disk - which will be C
You will also see you CD or DVD drive.
Now note what else you see.
Now stick in your usb stick
A new drive should appear - might take a wee while if the computer has to install it first.
Now open up this new drive.
Depending how your computer is setup, the window for MY COMPUTER may or may not disappear.
If it disappears, repeat the steps for getting MY COMPUTER back on screen.
Now go to where your pictures are.
Choose one of your pictures and either drag it to the window of your usb stick OR right click on it, copy, then go to the window of your usb stick and right click then paste.
If you can do it for one pic, you can do it for multiple pics.
Now close the usb window, go to safely remove in the menu bar and remove the usb stick.
Now put it back in and open its window as above - if the pics are on it success!