It also has some serious errors...
1) you don't need to restart your computer when you're running XP, NT, or Win2K.
2) you should set JAVA_HOME and refer to that in your path instead of the full installation directory. Many applications expect JAVA_HOME to be set and it also makes upgrading a lot easier
3) of course the actual directory to set depends on the exact JDK version you're using and where you install it.

But apart from that it's a nice checklist