If so, you're going to have issues finding a software that is free and doesn't use a watermark. Especially if you want to make half-decent quality videos with them. I suggest Fraps, but it costs. There is a trial, but it is extremely limited and only allows for 30 seconds of video recording time. Though I am under no circumstances suggesting or endorsing that you pirate it, but there are tons of cracks out there for it.
If you are only wanting to screenshot your desktop, then the trial of Fraps will do. It allows for high-quality screenshots with no watermark.
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