I was trying to uninstall my Java JRE 6u45 and then i kept getting the Error 1723, Did all i know and all google told me but a little more hack did the trick.

Here is an explanation on the Java Error 1723
Java Error 1723 states this: Error 1723. There is a problem with this Windows Installer package. A DLL required for this install could not be run. Contact your support personnel or package vendor.
This error can be received while both trying to Install or Uninstall any Java download. Therefore, if you have an old or corrupt Java, you may encounter issues installing / uninstalling it.

Here is how I Fixed Mine:

This fix will need you to tamper with your system Registry…

1. Uninstall all Java on your system
2. Delete all related Java folders on your machine . (C:/Program Files/Java and/or C:/Program Files x86/Java)
3. Open regedit. (run>regedit or search regedit)

Goto HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft

Remove all related java keys, then

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\4EA42A62D9304AC4784BF238120612FF (The number may change depending on how far the Updates went before you got the problem. You are looking for Java installer for the one stuck in ‘Programs and Features’

Then move on to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{26A24AE4-039D-4CA4-87B4-2F83216021FF}

Look for all that have Java information and remove them.

Once you have done that reinstall Java, It worked for me, Hope it works for you

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