Here are two simple steps to resize you images (shown from my computer) using the free stuff you get with windows.
Go to Windows Explorer and navigate to where you have stored your picture.
Do a right click on the picture file or thumbnail and go down to 'open with' and then to 'Microsoft Office Picture Manager'. Left click to open the image in that. You can see these areas as they are green on my computer.
Then click 'edit pictures' near the top right, and then edit options open up on the right and near the bottom of those, click 'Resize'
Put a dot by clicking next to 'Percentage of original width x height'
and now use the down arrow to drop the percentage to whatever it takes to get the image to the size you want. You can see the original size in pixels and the new size as you adjust it
Alternatively, you can simply reuce it by clicking 'Compress Pictures' (under 'resize') and put the dot in 'documents' which makes it a more managable size.
The second way is to use a simple tool that Microsoft Office provide for Windows XP (not Vista). I love this one.
It's down the right hand side called Image Resizer. Once it's installed, you can resize your image, or a lot of images at once, without having to open them. Saves a lot of time.
Let's say I want to resize only four images in a folder. I hold down the control key (ctrl on your keyboard), click one by one on the image icons (as you can see, I've highlighted four images), do a right click whilst your mouse is over one of those images, doesn't matter which one, and go down to 'Resize Pictures'.
This will open up a box which gives you options of size to store them at.