Not able to un/install java anymore

Hi,
a power failure interrupted installation of jdk-6u18-windows-i586.exe.
I'm not able to uninstall, install or reinstall Java now.
It's asking the reinstall-question in an endless loop.
I'm really obset about those overcomplicated installations where
things are spread all over the computer. If anything failes it knocks
out itself.
What do I have to delete to convince Java not beeing already installed?

You have one or more of the following things wrong:
Your installation file is corrupt -- solution, download a new one.
Your installation completed enough to let the installer see it already installed -- go to your Windows Control Panel and see if it is installed. If not, then just delete the local folders for Java.
Your registry is corrupt -- fun times. You have to manually edit your registry to remove the corrupt references to your Sun Java install.
Since you aborted the install with a power failure, you may have some temporary files in your C:/TEMP and C:/WINDOWS/TEMP folders--these folders should be empty at startup other than 1 or 2 files used by the system. Delete everything in those folder that will delete, then reboot and try again.
Hopefully it's just your install file--it's easily fixable by downloading a new one.
After trying all of these individually, except the registry edit--that is a last resort type of venture for most people, I check Control Panel and do the uninstall if one shows--to what ever extent it will function, then delete the folders for Java, then delete temporary files, then reboot. If I had not downloaded a new install file by this time, I do so, and then do the install.
If this does not work, then I do the system registry edit.
Have fun.

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