No need to re-take them, do this....
Very simple (assuming you are using Windows)....
This is a free image resizer program from microsoft.com Small program, easy to use, takes seconds to do, works perfectly.....
Click on the link below. It will take you to Microsoft's download web site.
You will see on the list "image resizer". Click the word "download" directly below it and go through the steps (save/run/install etc...)
Once installed, you right click on any image in your computer and a drop down window will appear. Click "resize image" on the list. A window will appear asking you what size to use. This forum uses "medium".
When you click the size you want it will make a duplicate of the image in your computer with the same name/number as the original with "(medium)" attached to it, and not change the original at all.
Flawless, quick, trusted. Merry Christmas.
(it's from Microsoft's web site, so you can trust it)
http://windows.microsoft.com/en-us/windows/xp-downloads#2TC=powertoys