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The Microsoft Java Virtual Machine (MS Java VM) handles Java applets on web pages, compiling and executing them.
Currently Microsoft no longer supports the MS Java VM, and preinstalled machines with Windows XP and Service Pack 1a (SP1a) come without it. Older machines still have the MS Java VM.

The Sun Microsystems Java VM is a replacement for the now obsolete MS Java VM. Instructions on replacing the MS Java VM with the Sun Java VM are as follows:

1. Click Start, Run and enter:
   • RunDll32 advpack.dll,LaunchINFSection java.inf,UnInstall
2. Click Yes to confirm the uninstall, and restart your system when it's complete.
3. Delete the following if they are still present:
   • The folder c:\windows\java
   • c:\windows\inf\java.pnf
   • c:\windows\system32\jview.exe
   • c:\windows\system32\wjview.exe
4. Click Start, Run and enter regedit to start the Registry Editor.
5. Browse to the following keys, highlight and delete them:
   • HKEY_LOCAL_MACHINE\Software\Microsoft\Java VM
   • HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\AdvancedOptions\JAVA_VM

Note:
For Windows NT4 and Windows 2000, replace c:\windows with c:\winnt.
For Windows 95, 98, 98SE and ME, replace c:\windows\system32 with c:\windows\system.

You can now download the Sun Java VM from here:

http://www.java.com/