It is therefore very important that everyone makes it a priority to download this Windows update. We would recommend you go to www.windowsupdate.com and click the 'Scan for updates' link. You can then find the update within the 'critical updates and service packs' section.
We would also highly recommend that you ensure you have downloaded and installed ALL of the critical updates for Windows as they all fix very important security flaws with the Windows operating system.
Thanks
RuneScape Customer Support.