How can i setup a software(for 32bit) in a 64bit system

HI, I have a 64bit win7 system, and I also have a sofeware that can work well in a 32 bit system, But it can not be setup in a 64 bit system,How can i make that work in my 64 bit system?
I have update the windows to latest.

Thanks very much.

Jonathan_King said:

Welcome!

What program is it? Try right-clicking on it, and selecting Properties. In the Compatibility tab, try running in compatibility for XP.

Thanks very much, but it seems still can not work. Need I restart the laptop?
It is a software for chemical equilibrim calculation.

"The version of this file is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need an x86(32bit) or x64(64bit) version of the program, and then contact the software publisher"---

Jonathan_King said:

Have you tried selecting "Troubleshoot compatibility"?

where can I find "Troubleshoot compatibility"?
thanks

Jonathan_King said:

Right-click on the program and select it from the menu.

It is said that "Incompatible application", but it do run well in another 32bit system,win xp(maybe).