How to fix SP3 installation on Intel MACs with Boot Camp.

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\Curr entVersion\Setup
3. On the Edit menu, point to New, and click String Value.
4. In the text box under the Name column, type BootDir and press ENTER.
5. Right-click the name BootDir, and then click Modify.
6. In the Edit String Value dialog box, type the drive letter for your system drive, and then click OK. For example, if your system drive is C:, type C:\.
7. Close Registry Editor.

After you have created this registry key (or if you created this key when you installed a previous version of this Service Pack), you can proceed with the installation.

1. Click Start - Run - Type “regedit” and press enter.
2. Navigate to
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Setup]

HKEY_LOCAL_MACHINE
\Software
\Microsoft
\Windows
\CurrentVersion
\Setup

3. In the right pane, Right-click and select New - String value
4. Name it as “BootDir” and set its value to “C:\”