You installed a current version (or installed an update) but you when execute it you get an error message?
This could have the following reasons:
Add-on warning displayed in Internet Explorer
If you are using Internet Explorer and have installed the latest Java Update, you may get the following warning when executing Java applets (e.g. drawing upload, multi download, multi upload, online edit, viewer):
With the last Java update of Sun Microsystems Java is now installed as an add-on within your Internet Explorer browser. Due to this new behaviour the warning message is displayed when executing a Java applet. Avoid this warning by adding the domain *.conject.com to your trusted sites.
Message: "Java is not installed" but Java is installed
It may happen that your recieve the message that Java is not installed but you already istalled it. To check if your computer generally can start Java applets please click on this link:
Arter some seconds the java check will show you the results. If no results are shown or if you get an error message, please contact your administrator! In most cases it will help to remove Java from your computer and then to install it new.
Problems with Java in a 64-Bit Browser
In general if you have a 64-bit versions of the Windows operating systems you are going to use a 32-bit Internet Explorer (IE) browser as the default browser for displaying web pages. These operating systems also include an Internet Explorer browser for 64-bit systems. However, its use is optional and must be explicitly selected for displaying web pages. Because some web content does not work properly in a 64-bit system browser, we recommend that you use the 32-bit default browser and download Java for 32-bit systems.
In any case, the installed Java version (32bit or 64bit) must match the used browser version (32bit or 64bit). Otherwise Java wont work.
This is also true for Mozilla Firefox.
See also the official page of Oracle: http://www.java.com/en/download/faq/java_win64bit.xml