IE 6 is quite old; I've only got IE 7 on my machine, so perhaps someone else with IE 6 could comment on whether it works with the charts. Also check your security settings (Tools > Internet Options > Security tab). Make sure that the site is in the trusted zone, and that Java is enabled for that zone.
I still use IE6. No problem opening the SBK charts. Are you using Norton Anti virus? That has given many a computer user problems. Good virus protection, but sometimes it is overly cautious, and blocks stuff you do not want blocked.