Microsoft Java Virtual Machine [MSJVM]
A few years ago Microsoft and Sun went head to head in the courts over Java and who was entitled to use it in what situations. To say it was a boring case would be an understatement. The bottom line was that Microsoft agreed to a limited timeframe in which it would continue to use the Sun source code. See, you're bored with this already, aren't you? Here are a few frequently asked questions regarding Java and Windows XP
Q - How do I tell if Java is installed on my system?

A - Perform the following steps:
> Click Start > Run
> Type CMD and click OK to open a command prompt window
> At the command prompt type jview and press ENTER
if u see " jview " is not recognised as an interrnal or external command , operable program or batch file ... then Microsoft Java Virtual Machineis not installed
Q - What's the deal with Service Pack 1 and Service Pack 1a as they relate to Java?

A - It's a long story but basically if you have an older copy of XP (often referred to as a Gold copy) then JVM is installed with the operating system. If you updated to SP1 (no longer available) then JVM remained intact. If you updated to SP1a then JVM was removed, or if your copy of XP was manufactured and shipped after SP1a was released then JVM was never present on your machine. The only difference between SP1 and SP1a is that JVM isn't a part of SP1a. The safest way to know for sure if JVM is present is to use the method described above.
Q - What about updates for Microsoft JVM? Are they still available ?
A - Use Windows Update and if they are needed for your particular installation they will be available for download.
Q - I have Microsoft JVM but want to get rid of it and use Sun Java. Can Microsoft JVM be removed from XP?
A - There are many sites that have batch files and scripts available that automate the removal process. A search of the internet should turn up quite a few choices or the steps to manually remove it are below. Before you remove it though, consider the possibility of doing a clean install of XP and then updating it via Windows Update. If you still have the original JVM installed it's likely there is a lot of other old junk hanging around as well. The system might benefit from a complete reinstall and gain a boost in performance. Remember to have a full, current, usable backup before reformatting and installing the operating system
* Click Start > Run
* Either type or copy and paste -- RunDll32 advpack.dll,LaunchINFSection java.inf,UnInstall -- in the Open: line and click OK
[ If you get an error that says java.inf can't be found then you didn't use the procedure in the first question. JVM isn't installed. ]
* Open Windows Explorer and delete the following directories and files
C:\Windows\Java

C:\Windows\Inf\java.pnf
C:\Windows\System32\jviw.exe
C:\Windows\System32\wjview.exe

* Open Registry Editor ( Start > Run > type regedit in the Open: line and click OK ) and delete the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Java VM
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\InternetExplorer\AdvancedOptions\JAVA_VM
* That's it. Reboot the system and the Microsoft Java Virtual Machine is gone from the system.
Q - Is it necessary to have Java installed on the system?

A - Nope. You'll miss a lot of content on the web and many websites will not display properly, but it's not essential to have any form of Java installed.
Q - Can the Microsoft Java Virtual Machine be reinstalled after it has been removed?
A - Only if you have an original Gold Edition XP CD or one manufactured before the integration of SP1a.
Q - How do I get Java re-installed on the system?
A - Go to the Sun Microsystems website at www.sun.com and use the automatic Java installer.


- srikanth dhanwada