This is what worked for me. Open the Java control panel, go to the advanced tab, expand the Java Plug-in node and uncheck the box. 
Hi, We are running jre 1.6u11 on our client machines  (latest version available from sun) But I'm unable to use to the ITA webinterface, I get the error : IT Assistant will not launch because a dependent component is not installed. This may happen if :  Is there a fix for this ? ITA version 8.3.0 Workstation is running Vista x64 SP1 (+all updates) I also tried connecting from a windows xp machine, but this also doesn't work. Help about / details shows :  Active Directory Snap-inVersion 4.2.0 IT Assistant Connection ServiceVersion 3.3.0 Sun Java Runtime Environment for IT AssistantVersion 1.6.0 Core Service for IT AssistantVersion 3.3.0 OpenManage Tools for IT AssistantVersion 3.3.0 Dell OpenManage Management StationVersion 5.5.0 Remote Access Controller 5 Management StationVersion 5.5.0  
Dell OpenManage IT Assistant + jre 1.6u10 / jre 1.6u11