Have you tried uninstalling all versions of java in add/remove programs, then reboot and install the latest version?
Have you tried uninstalling all versions of java in add/remove programs, then reboot and install the latest version?
No dice after reboot and reinstall.
what browser are you playing in? i would try a different browser or get the runescape desktop icon from the runescape downloads. It may be an issue with your browser.
can you take a screenshot of the error that's popping up?