Check the system information under the control panel, it should state the version of Windows you have installed, and it should display the SP version if one is installed.
Quick shortcut way to this info is just pressing the keyboard combo of the WINDOWS key and the Pause/Break keys together.
For referrence, you can download older java releases from Sun here:
http://java.sun.com/products/archive/
You can download SP 2 here:
http://www.microsoft.com/downloads/d...displaylang=en
SP 2 update
http://www.microsoft.com/downloads/d...displaylang=en