Joey - Hang in there!
If you can get your original pic (which is dang nice, btw) into your "My Pictures" folder (if using Windows), you should be able to simply move your cursor over the icon (if in view icons) or simply read the file size (if in view details mode) to get the file size. I can't remember what the file structure is if you're using a MAC.
If you're using Windows, you may have a program like Paint within your Accessories folder. If you do, you can open the file and resize it manually. A better app to use that you may have installed is Microsoft Photo Editor. You can resize in this a little easier. If you use XP, here's a link:
http://www.microsoft.com/windowsxp/using/digitalphotography/learnmore/tips/eschelman2.mspx. Another approach would be to send the pic to yourself as an email, selecting to send it in reduced size. Save the file (under a different name so you retain the original) and you should end up with a version less than 100kb.
Some of this is a matter of successive approximations and some is a little more direct.
I'm no PC guru, but I've used all these approaches when confronted by a similar challenge. I have an HP that came with image editing software that I use, so I'm lucky to remember these approaches!
You'll get it.
BP