Error message when you install Windows Server 2003 Service Pack 1: "There is not enough disk space"

When you install Microsoft Windows Server 2003 Service Pack 1 (SP1), you receive an error message that resembles the following:

This problem occurs because a customized driver cache path is specified in the following registry subkey:

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To work around this problem, follow these steps:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup\DriverCachePath
3. In the right pane, right-click the DriverCachePath entry, and then click Modify.
4. In the Value data text box, type %systemroot%\Driver Cache.
5. Click OK, and then exit Registry Editor.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.