"Checking operation system version" error when installing Oracle Client on Windows 7

Problem:
When I tried to install Oracle 10g client on Windows 7 64-bit, I received the following error:



Starting Oracle Universal Installer...
Checking installer requirements...
Checking operating system version: must be  5.0, 5.1, 5.2 or 6.0 .    Actual 6.1
      Failed <<<<

Exiting Oracle Universal Installer, log for this session can be found at C:\User
s\ASLOBI~1\AppData\Local\Temp\OraInstall2010-05-10_11-09-12AM\installActions2010
-05-10_11-09-12AM.log

Please press Enter to exit...

Solution:
Go to MAIN_INSTALLATION_DIR\install directory and open openparam.ini file.
Add 6.1 value in [Certified Versions]\Windows section.

In addition, add the following section in the MAIN_INSTALLATION_DIR\stage\prereq\db\refhost.xml file:

Now the installer works.