Beware of Screenshots.  Make them freely but keep track of them.  They are TGA files, which are huge.  Some are 5 megabytes or more.  The other day, I noticed I had a lot of them I never looked at, but just left hanging around.  I discovered they were taking more than a gigabyte of disk space.  That can matter.
 
Recommend you convert them to JPEG or Bitmap files and keep them in your Pictures or other directory, or save them to a CD or DVD and clear the screenshots file periodically.
 
Bernie