I noticed the following after installing and then uninstalling 6u10-b31 on Vista64:
1) Install 6u10-b31
2) Uninstall 6u10-b31
3) Lanuch IE
4) Click on "Tools > Manage Add-ons > Enable or Disable Add-ons"
Notice "Java(tm) Plug-In 2 SSV Helper" is still there and has not been removed. I've also tried this on b29 and earlier versions and the same happens for "Java(tm) Plug-In SSV Helper".