I don't often say too much about paid shareware but if you need an excellent screen capture program, one that can edit the still captures it makes and even make full motion video screen recordings, you should take a look at this program. I have found it MUCH easier to use than SnagIt (not to mention a ton cheaper to buy!) It's even available in a portable version, so you can take it with you on a flash drive and use it on any Windows PC. I use it daily at home and at work. If you need something like this, its well worth a look!

http://www.faststone.org/FSCaptureDetail.htm