If you already have Microsoft Java Virtual Machine installed, you can update your version here.

If you're not sure what you have, or you know you want VM in XP, click here to test your system and begin the download of 5.00.3810. This will begin the download if your system does not already have Virtual Machine. This is a 6 MB download and may take several minutes to complete.

To check your current version, you can open a command prompt or MS-DOS window and type jview at the prompt. Choose Start/Run and type command and then jview. The top line will show your current version. You may also search your computer or System folder for msjava.dll. Right-click (reverse-click for left-handed users) on the file and choose Properties and then Version.

You can download Sun Microsystems' Java software at their web site.

If you have both Microsoft and Sun installed:

Switching between the Microsoft VM and the Sun JVM™ in Internet Explorer

You can switch between the Sun Java™ Virtual Machine and the Microsoft VM. The Sun JVM can be enabled and disabled without having to uninstall it. Switching back and forth between these Virtual Machines can be done through the Advanced tab in your Windows Internet Options Control Panel, OR by using the Java™ Control Panel. Hint: it's good to check both places.

Instructions for switching between the Sun JVM and Microsoft VM using Internet Options:

Open Control Panel by clicking Start->Settings->Control Panel
Open the Internet Options window by double clicking Internet Options
Click the Advanced Tab
Find the "Java (Sun)" item and check or uncheck the checkbox which says
"Use Java 2 v 1.4.x for applet (requires restart)"
Check or uncheck the box next to Microsoft VM
Save your changes by clicking the OK button
Restart the browser