I have a vanilla Snow Leopard 10.6.3 machine, based on Gigabyte 965P-DS3 Mainboard and Core2Duo CPU.

Used BootThink 2.4.6 with these extensions to install and run the system. Everything works great, except the Photoshop CS4 installation.

When I try to install Photoshop CS4 Trial downloaded from adobe.com I get the following error — http://dl.dropbox.com/u/175767/Trash/install_error.png

The dmg is not damaged, passes verification and I can easily install Photoshop on my Macbook using it.
I have tried Mac CS4 Cleanup Utility from Adobe, to cleanup the system, but it didn't help.

Any ideas what can be causing the problem and how to solve it?

Solved. Add a new user account with Administrator privileges, install Photoshop under it, then remove the account.
Its a rare Leopard bug, not a hackintosh bug.