Some pre-Service Pack 1 (SP1) hotfixes do not migrate to the SP1 version when you update your computer to Windows XP SP1 (887822)

SYMPTOMS

When you update your Microsoft Windows XP-based computer to Windows XP Service Pack 1 (SP1), some pre-SP1 hotfixes that were installed on your computer may not successfully migrate from the release version of Windows XP to Windows XP SP1.

Notes

• When you install a Windows XP pre-SP1 hotfix on a Windows XP-based computer, an SP1 version of that hotfix is also copied to the computer for use when you update the computer to Windows XP SP1. When you update the computer to Windows XP SP1, the SP1 version of the hotfix is automatically installed.
  
  For additional information about this automatic process, click the following article number to view the article in the Microsoft Knowledge Base:

  328848 Description of dual-mode update packages for Windows XP

• To verify whether a hotfix migrated to the Windows XP SP1 level, review the Xpsp1hfm.log file in your Windows folder.
• This problem does not occur when you update to Windows XP Service Pack 2 (SP2) in either of the following cases:
  • You update from the release version of Windows XP without hotfixes installed.
  • You update from Windows XP SP1 with pre-Windows XP SP2 hotfixes installed.
• After you update your computer to Windows XP SP1, some pre-SP1 hotfixes cannot be installed. You may receive the following error message:
  Setup encountered an error: Files from the package are incompatible with files on your system.
  This error message is listed in the log file for the update, such as KBxxxxxx.log. The Windows Installer program also returns an extended error code 0xf0f1.