After the subject upgrade, you Windows XP Professional computer takes a ling time to run the startup process.
This behavior occurs because the Shell Hardware Detection in Windows XP responds very slowly.
To workaround this behavior:
1. Open a CMD.EXE windows.
2. Type REG ADD HKLM\SYSTEM\CurrentControlSet\Services\ShellHWDetection /V Start /T REG_DWORD /F /D 3 and press Enter.
3. Shutdown and restart Windows XP.
NOTE: This workaround should fix the slow startup, but may disable Autoplay and Fast User Switching.