Ok, here is an idea you can try.
Installing the Pack in Windows Safe Mode.
Use the System Configuration Utility to start Windows XP in Safe mode
- Close all programs.
- On the Windows taskbar, click Start > Run.
- In the Open box, type the following text:
msconfig
- Click OK.
- In the System Configuration Utility, on the BOOT.INI tab, check /SAFEBOOT.
- Click OK.
- When you are asked to restart the computer, click Restart.
The computer restarts in Safe mode. This can take several minutes.
Try running the installer now, when you are finished:
Use the System Configuration Utility to start Windows XP in Normal mode
- Close all programs.
- On the Windows taskbar, click Start > Run.
- In the Open box, type the following text:
msconfig
- Click OK.
- In the System Configuration Utility, on the BOOT.INI tab, uncheck /SAFEBOOT.
- Click OK.
- Close all programs, and restart the computer.
This helped several people already. Good luck! 