Hello Ebeli,
What is the error you are getting when trying to install your 32-bit application in your 64-bit system?
By default, there are two program files folders, 'Program Files' and 'Program Files (x86)'. By default, 32-bit applications will install to 'Program Files (x86)', and 64-bit applications will install to 'Program Files'.
It may be that your application is not compatible with Windows 7 and not that it is a problem with your 64-bit versus 32-bit.
If the program is not compatible, then you may try to install and run the program in compatibility mode.
Use the following steps:
1) Right click on the Program
2) Click on Properties
3) Click on Compatibility tab
4) Select Run this program in compatibility mode and select Windows Vista or whatever operating system the program was running successfully.
Refer to the link here: Make older programs run in this version of Windows
http://windows.microsoft.com/en-us/windows7/Make-older-programs-run-in-this-version-of-Windows
If the compatibility is not successful, then try and runthe Program Compatibility troubleshooter:
1. Open the Program Compatibility troubleshooter by clicking theStart button.
Then click Control Panel. In the search box, type troubleshooter, and then clickTroubleshooting. Under Programs, clickRun programs made for previous versions of Windows.
2. Follow the instructions in the troubleshooter.
If you cannot install a program, insert the installation disc for the program and, using the troubleshooter, browse to the program's setup file, usually called Setup.exe, Install.exe, or something similar. The troubleshooter is not designed to work on programs that have an .msi file name extension.
Please reply back and let us know if this helps or if your issue is resolved.
Sincerely,
Marilyn
Microsoft Answers Support Engineer
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