It's really simple to do if you're on a desktop and you have a second drive mounted in the system, but if you're on a laptop, it can be a bit more difficult. Recording to the same HDD as the game will lag both the game and the recorded footage. This applies no matter what game you're recording or what program you use. Major protip though: record to a hard drive other than what the game is installed to. and possibly Ubuntu if you use WINE, but I wouldn't recommend it. The only forseeable issue you may have is that CamStudio only works in Windows. You can assign record/pause/stop hotkeys to whatever you're not using in the program you're recording (I like F10 to record/pause and F12 to stop, since it doesn't conflict with Minecraft or Roblox), and you can choose to record a microphone or game sounds (Line In and What-U-Hear or Stereo Mix respectively, don't think you can do both at once though).

It does make the filesize a lot bigger, and some programs don't like CamCodec-encoded files (MovieMaker's okay with it, and with some tweaking, you can re-encode with MediaCoder), but the quality is really good), and the interface is really simple. It has most of the features of other paid programs, you can use a wide variety of codecs (pretty much any Windows-compatible codec you have on your computer, but I prefer the CamStudio Lossless Codec that's an optional add-on.

CamStudio is basically the best freeware recorder you can get.

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