Error Code 8000FFFF
For Windows Vista, if you open Windows Update and get the Error Code 8000FFFF message. Then this is mainly because your registry is mess up.
Below are the fix from Microsoft:
1. Click Start
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Start button
.
2. In the Start Search box, type regedit.
3. In the Programs list, click Regedit.exe.
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User Account Control permission
If you are prompted for an administrator password or confirmation, type the password or click Continue.
4. Find and then click the following registry subkey:
HKEY_LOCAL_MACHINE\COMPONENTS
5. Right-click COMPONENTS.
6. Click Export.
7. In the File Name box of the Export Registry File dialog box, type COMPONENTS.
8. Click Save, and then click COMPONENTS.
9. In the details pane, right-click PendingXmldentifier, and then click Delete. If this value does not exist, go to the next step.
10. In the details pane, right-click NextQueueEntryIndex, and then click Delete. If this value does not exist, go to the next step.
11. In the details pane, right-click AdvancedInstallersNeedResolving, and then click Delete. If this value does not exist, go to the next step.
12. Restart the computer, and then try again to update the computer.
You can also click below for the auto fix from Microsoft.
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Put into a batch file it would be:
@echo off
echo Exporting HKEY_LOCAL_MACHINE\COMPONENTS to C:\HKLM_backup.reg
REG EXPORT HKLM\Components C:\HKLM_backup.reg
echo;
echo;
echo Removing noted problematic registry keys
REG DELETE HKLM\Components /v AdvancedInstallersNeedResolving
REG DELETE HKLM\Components /v PendingXmlIdentifier
REG DELETE HKLM\Components /v NextQueueEntryIndex