Step 1: Step 1: Open Computer on your desktop
Go to your desktop
Proceed to Step 2.
Step 2: Step 2: Click on your hard drive
In this case, the hard drive is named Local Disk. You will need to open this to get to the next step.
Step 3: Step 3: Open the "Web" folder on your hard drive
Step 4: Step 4: Open the "Wallpaper" folder and replace your wallpaper for good
Step 5: Step 5: Replace your wallpaper
To do this you need to find the image you wish to replace the wallpaper with. Copy this image. On my computer, I will actually download an image from the Internet. This part is unnecessary unless the picture you want isn't available. Once you have copied the desired image, paste it into the folder you opened back in step 4.
And that's it. You're done.