(Errno::EACCES) Permission denied with pygments.rb

I have been really struggling with installing pygments.rb and did not find solution whatsoever. I'm a newbie in this. This is the error code:

PS C:\Users\PC\Desktop> gem install pygments.rb

ERROR: While executing gem ... (Errno::EACCES) Permission denied @ rb_file_s_symlink - (vendor/pygments-main/scripts/debug_lexer.py, C:/tools/ruby23/lib/ruby/gems/ 2.3.0/gems/pygments.rb-1.1.1/vendor/pygments-main/scripts/find_error.py)

Thank you for your help.