Updates to the Microsoft Virtual Machine (Microsoft VM) are available only if you are currently running a version of the Microsoft VM.
Note Microsoft does not produce a 64-bit native Microsoft VM, but this information also applies to the 32-bit Microsoft VM under WOW64 in 64-Bit versions of Windows.
Because the Microsoft VM is not included with some versions of Windows, programs that require the Microsoft VM may not work properly if it is not installed.
For additional information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
286476 Error Message: One or More Components Required to Run Vizact Are Not Properly Installed
813926 Differences Between Windows XP S813926 and Windows XP S813926a
Internet Explorer no longer offers the Microsoft VM by means of Install on Demand. Security updates to the Microsoft VM are available from Windows Update only if you are already running a version of the Microsoft VM.
Hardware manufacturers may have included the Microsoft VM on computers that had Windows XP preinstalled, and the Microsoft VM was included with earlier Microsoft operating systems. The Microsoft VM may also be included with some third-party programs. Third-party Java virtual machines are also available, but Microsoft has not tested any third-party virtual machines with Windows.
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.