J2SE Version (please include all output from java -version flag):
  6u28

Does this problem occur on J2SE 1.4.x, 1.5 or 6? Yes / No (pick one)
  also with 6u26

Operating System Configuration Information (be specific):
  Windows 64-bit system
  IE 9

Bug Description:

  installed the Java 7 Plug-in, both 32 and 64-bit, on 64-bit
Windows 7 system. That works fine.

  When uninstall both 32 and 64-bit Java 7 Plug-Ins and install
Java 6 Update 26 or 28 (the only 2 updates have tried),
again both 32 and 64-bit variations, <applet> tags in 64-bit
MSIE 9 don't find the Java 6 Plug-In.
All is well once when move back to Java 7, though.

  The general oddity did block CAP member from testing with 64-bit
MSIE and no bother testing 32-bit MSIE on my 64-bit system.

  It seems like an <applet> tag wide issue -- as if Java 6 wasn't
re-registering with MSIE properly after Java 7 was installed.

  Had Java 6 working just fine in MSIE 9 with the same tags and
don't *think* anything else changed other than installing Java 7.

  Have a policy of having only 1 Java Plug-In version installed
at a time as have seen too much weirdness over the years
resulting from multiple Java Plug-In versions being installed
even though that should work fine.