If some simple cropping etc. will take care of your problem, probably the picture manager, which is a part of the MS Office would suffice. This will take care of redimentioning to make them fit for uploading, a few other simple features like adjusting the tones, brightness, contrast, red-eye reduction etc. If you have the Office 2000 or newer, this program should be in it. (Just make sure to make a copy when you do the modification, so the original will be saved as well.)
But if you like photography, Photoshop is really an amazing tool, worth every penny... it can do so many things that I could only dream of in the days of yore... for me learning to use it came pretty easily. (this coming from someone who still struggles with the function of MS word!) In a very short period of trial it became one of my favourite "toys". This site
was very very helpful for me to get the 101 of Photshop down 4 years ago, it covers most of the basic but useful technique in a very approachable, unthreatening, easy-to-follow fashion. Worth a look for any beginners.