On a Windows Vista-based computer, or on a Windows Server code name “Longhorn” -based computer, you install an update package. However, the installation may fail. Additionally, you may also receive the following error message:
Not enough storage is available to process this command.
Note The installation failure occurs if the update package is designed for one of the following operating systems:

• Microsoft Windows 2000
• Windows Server 2003
• Windows XP

When you check the free space on the hard disk, or when you check the physical memory, you find that there is sufficient space to install the package. Therefore, you may find that the error message is misleading.