This is great software! BE AWARE, there are some evil little pricks out there distributing garbage under the camstudio name! Only get your installer from here on sourceforge!
It's pretty rare that I miss the opt-out hidden in license agreements. Ended up with loads of malware/spyware/adware garbage littered around my system. Also: lost the first recording due to crashing. [ I will, you should ] probably just keep looking.
I'ved used CamStudio on and off for the last few years, and it's OK, it gets the job done. I experienced issues with either video and/or sound here and there when I used it. I never experienced any of the spyware/malware/adware issues, but it was always a concern. Thanks to a comment here on sourceforge I tried Screenpresso for the first time today and I was impressed. The free version has branding in the video recordings, but the single-license price seems very reasonable. So far a much better experience than with CamStudio. UPDATE: FYI, the last time I downloaded and installed CamStudio was about 1 year or more ago on a computer that I no longer use. After reading some of the terrible reviews here regarding the spyware/malware/adware, it seems that these issues exist in the most recent version(s). As such, I will NOT be installing the most recent version. I'll stick with Screenpresso for now.
Beware the main project page at camstudio.org currently has a malware version of this download linked on their main page. "hxxps://..../CamStudio_Setup_v2.7.2_r326_(build_19Oct2013).exe" is the malicious link. Do not download that version. The malicious file is around 640kbs in size.
Try screenpresso its a really cool screen capture software.