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How can I check if Sun JavaVM (Virtual Machine) is installed on my computer? If it is, how can I check the version of Sun JavaVM?

Click 'Start' menu and select 'Control Panel'.
(Depending on the Operating System you are using, the menu name and direction maybe slightly different.)
Click 'Add/Remove Programs'.
If "Java2 Runtime Environment" is in the 'Add/Remove Programs', Sun JavaVM is installed. You can also check the version of it.