a quick way is to do this...
click on "Start" then "run" then type "mspaint" open the file in question, then from the menu of mspaint, click on "image" then click on "Attributes"
Choose to resize it in "pixels" best sizes are 800 x 600, 1024 x 768 & for smaller size 640 x 480.
try a few & see what you get - remember to save them as "jpg" files as well
click on "Start" then "run" then type "mspaint" open the file in question, then from the menu of mspaint, click on "image" then click on "Attributes"
Choose to resize it in "pixels" best sizes are 800 x 600, 1024 x 768 & for smaller size 640 x 480.
try a few & see what you get - remember to save them as "jpg" files as well