For the benefit of the OP, if the OP didn't install with admin privileges, then c:/bin/perl might not have been added to the PATH, and the above commands will tell you if perl is installed at all (as a default ActivePerl installation). In which case you can create a shortcut similar to what is described in bart's journal to adjust the path before getting to the command line.

Also, the OP should mention that this question has already been asked.