Gunny,
There are two parts to the equation with any type of graphic image (i. e. "pictures"). There are the pixel dimensions of the picture itself, and the format the image is saved in - examples are JPG (also known as JPEG), GIF, TIFF, BMP and several others. The JPG (or JPEG) format uses a fairly good compression routine so image files saved as that type are usually many, many times smaller sized files that most of the other formats.
Go into your Adobe Photo Deluxe software and open the image you want to work with. First, shrink it to the appropriate number of pixels (50x50 for the avatars here), and then you will be wanting to convert it to the JPG format.
On my Microsoft Image Editor software, this is easily done by going to the "File" pulldown menu, selecting "Save As... " and then in the dialog box that comes up, usually at or towards the bottom of the entire dialog box, there is the "save as type" or something like that sub-window which should have a listing of all the different file types your software can save image files as. Select JPG (or maybe called JPEG) and then save your file.
You can use the Microsoft Windows Explorer (as opposed to Internet Expolrer) to view the file, and then under the "View" pulldown menu, select "Details" which will show you, among other details about each file and folder, the size in bytes of the file. That way you can see if in fact the file is now of the appropriate size to be used here as an avatar.
Hope this helps clear up your problem,
Tom