http://support.microsoft.com/default.aspx?scid=kb;en-us;168806
How to Troubleshoot Java Problems in Internet Explorer
"
1. Click Start, click Run, type control inetcpl.cpl, and then
click OK.
2. For Internet Explorer 3.x, on the Advanced tab, click to
clear the Enable Java JIT Compiler check box, and then click OK. For
Internet Explorer 4.x, 5.x, and 6, on the Advanced tab, click to clear the
JIT Compiler for virtual machine enabled (requires restart) check box, and
then click OK.
3. Restart Internet Explorer and then visit the Web site that
exhibited the problem, and test to determine whether the issue has been
resolved. "