Adobe Reader 7 is a program to read PDF documents which is used when downloading manuals and books from the internet usually so this won't read it.
Paint, and photo editing programs like that would:
Adobe Photoshop Elements 3.0 tryout
Thats the file, all the way down the list that Techy Geek meant , not Adobe Reader. Thoguh even that seems to be just a trial, so just delete that program you have. You must have seen Elements after Adobe Reader and saw it as the one to get.
As for the file you need to convert, if it's a JPG file, it is converted and can be successfully sent. To view the image to test if it works, right click the image file, and go to Preview. It will open it in Windows XP's default image viewer, 'Windows Picture and Fax Viewer'. If Previews not there, it will be in 'Open with' and then select the windows picture and fax viewer.
I hope this helps, and you have done it right, don't worry that you couldn't open it in that program. You shouldn't be able to