It did occur either when we installed the trial copy!!! Anybody knows what happened??==============================================
Partial installation and setup occurred.|Below are details about the features that failed to set up.|An exception occured while downloading feature from “jar:file:/G:/Notes Domino 8/Notes Client 8.0/updateSite.zip!/features/com.ibm.productivity.tools.share.feature_3.0.0.20070725-1652.jar”.|-null|An exception occured while downloading feature from “jar:file:/G:/Notes Domino 8/Notes Client 8.0/updateSite.zip!/features/com.ibm.rcp.aaf.feature_1.0.0.20070803-1143.jar”.|-null|
Subject: SOLVED!!!
Not enough RAM drive/Temp folder space!!! 
Subject: Symphony does NOT work in this case!
When I clicked the Symphony icons on the home page of Notes client, it said “applet not installed”.
The weirdest thing is:
When I logon as User B into the same Windows and started Notes Client for this User B for the first time, Symphony was installed automatically and was run successfully!!!
Then when I login again as User A, Symphony still not works!!!
Subject: Another Error when re-installed!!!
1210583306921;0;0;0;0;2;Partial installation and setup occurred.|Below are details about the features that failed to set up.|CWPPR0544W: Feature com.ibm.productivity.tools.feature_3.0.0.20070725-1652 failed to configure due to an unexpected exception.|-Feature com.ibm.productivity.tools.template.feature is uninstalled.|Unable to complete action for feature “com.ibm.productivity.tools.standalone.feature” due to errors.|-Error reported by custom install handler for feature “com.ibm.productivity.tools.standalone.feature”. [C:\Program Files\IBM\Lotus\Notes\framework\shared\eclipse\plugins\com.ibm.productivity.tools.standalone.addin_3.0.0.20070725-1652\seditorReg.dll (The filename or extension is too long. )];