An alternative lossless video codec

I've been wanting to install a lossless video codec so that I can record something or other.  The recommended codec to use is the Techsmith Camtasia screen recording codec.  However, this only decodes and lacks the support for encoding.  Trying to encode gives the following dialog:

Installing the trial of Camtasia Studio unfortunately doesn't magically open up the encoding functionality for the trial period.  Luckily there's a free alternative in the confusingly named CamStudio.  CamStudio provides its own lossless video codec based on both LZO and GZIP.

There are a few teething issues.  I use Windows 7 64 bit and rhe codec doesn't appear in the list offered within the application I want to capture video within.  But thankfully moisamva has provided instructions on how to manually correct the installation, and they work for me.