Here’s my current setup:

Laptop Model: Toshiba Satellite M100
OS: Windows Vista Home Basic (32bit)
Memory: 4GB

Problems Encountered:

• Installation Successful (but with errors, you know what  I mean haha)
• Upon execution, Photoshop will display an error saying “Some of the application components are missing from the application directory, Please reinstall the application”
• Program will terminate after that.
• Even you reinstall photoshop and other components, you will receive the same bugging error every time you try to run Adobe Photoshop.

The Solution:

Here’s what I did, I had actually done several steps, though I can’t identify which of them actually causes the problem, nevertheless, I made it worked lol! . Make sure that you are not connected to the internet upon doing this for you will going to disable some applications that will put your system on risk.

• If you will check the details of the error after the setup, you will see some error related to “language” something. I made sure that my system is using “ENGLISH (US)” language. This can be set on Control Panel -> Regional and Language options
• Disable or stop “Bonjour” service (not required if the said service does not exists) . Go to Control Panel -> Admistrative Tools -> Services -> Bonjour Service then click stop. (Got this suggestion on some forum, I really forgot where for I was in the office when I saw this)
• Disable your Firewall or Internet Security Software
• If you already installed Adobe Photoshop CS4, uninstall and reinstall. Make sure to choose “ENGLISH (US)” as your prefered language.
• Installation should be successful (without errors)
• Enable everything and connect to the internet to activate Photoshop

Note: Language settings is not necessarily required to be english (US), just make sure you’ll use the same language as defined on your Language settings

Hope this helps

Disclamer: Try the above proposed solution at your own risk lol. This worked for me and I am thinking this might work for you too