HANDS DOWN.......simplest method.......
go to
http://www.microsoft.com/windowsxp/Downloads/powertoys/Xppowertoys.mspx
download: imageresizer.exe
(link at right of screen near bottom)
Once this is installed you can simply right click an image, select "resize", and then select the setting you prefer ("smallest" for CBid).
Windows will then place a resized copy of your image in the root directory.