I have a similar experience.
Try silently install.
To silently install Informix JDBC Driver on Windows
1. If you are installing from a CD, load the disc into the CD-ROM drive.
If you are downloading the driver from the Web, download the
"setup.class" file into a temporary directory.
Note that this temporary directory should not be the same as the
installation directory (%IFXJLOCATION%).
2. Using Windows Explorer, create a directory to hold the contents of
Assume, for this example, that the new directory is called
3. Change directory to either the CD-ROM drive, if you are installing
from a CD, or the temporary directory that contains the downloaded
"setup.class" file, if you are downloading the driver from the Web.
4. Execute the following command at the Windows command prompt:
java setup -o <directory> -D serialNo=<serial_no> key=<key>
where "directory" refers to the directory that will hold the
contents of the driver (created in Step 3 of these instructions)
and "serial_no" and "key" refer to the installation serial number
The keywords "serialNo" and "key" are case sensitive. You can also
use the keywords "SERIALNO," "serialno," and "KEY".
For example, to install in the directory
"c:\work\ifxjava_home" using a serial number of INF#J123456 and
a key of ABCDEF, execute the following command:
java setup -o c:\work\ifxjava_home -D serialNo=INF#J123456 key=ABCDEF
If the directory already contains the product files, the
command asks you if you want to overwrite them.
The installation is complete once the command has finished
>I have installed Informix Dynamic Server v 9.21 on Windows 2000, but am
>unable to install JDBC for infomix. I ran ... java setup, but get the
>"The installation program has determined that your system does not have the
>virtual machine required to run Informix JDBC Driver Version 1.50.JC1. You
>need. Java 1.1 on any OS from any vendor"
>The JRE exists in "d:\informix\krakatoa\jre". And, Java is installed in
>"c:\Program Files\jbuilder5\jdk1.3". Furthermore I have set the JAVAHOME
>environment to "c:\Program Files\jbuilder5\jdk1.3". Any suggestions would be
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