Problem removing the older Java program

Just downloaded the latest Java Version 7, no problems.
However, when l tried to get rid of my older version, Java(tm) version 6 Update 32, it says that the installer is missing a dll (no name mentioned) and cannot continue.
Did this via the add/remove programs in control panel, and also Revo Uninstaller,
but the same message appears.
Then tried downloading Java 6_32 again in case that was somehow corrupt, but it wouldn't install because of this un-named missing dll!
I suppose l could just delete the directory concerned but surely that would leave remnants behind as opposed to a clean uninstall.
Any ideas of how to remove this?

Thanks Danny, knew about this one.
Having looked a bit more closely, Java 6 is showing up in my control program (add/remove programs), but when l do a list of the files in the program directory, there it isn't! (just the directory entry for Java 7).
It hasn't caused a problem, but the add/remove programs list says it is using 95mb.
Apart from a clean install which will cause me more problems than not, just wondering whether anyone else has got any suggestions?
Thanks again.

Have you tried Rivo Uninstaller.
It is meant to do this job. Install is and see if Java is there
then if normal uninstall dint work it have force msi uninstall.
Try it.

Ok everyone, problem fixed (l think?).
Thanks for the link Danny re going into regedit.
A bit daunting for me, but one of the entry keys was for Java 6(tm) Update 32.
Deleted this and bingo, it has gone! Went ,into control panel, add/remove programs and it is no longer there.
Thanks very much.
Regards