My WPI installation is giving me the notorious rb_config.js error upon exiting. However, the error only appears on machines built with XP Pro Service Pack 3 integrated. The very same WPI installation, when run on machines built with XP Pro Service Pack 2 (and hotfixes) runs just fine. I thought I might be missing some IE6 updates to the Service Pack 3 version, so I ran Windows Update (without installing IE7) to check. I ran WPI again, and it threw the rb_config.js error again. The errors occur when WPI finishes installing. I read in another thread that the errors show up and prevent the rest of the WPI applications from installing. This is not the case, though I believe that some WPI applications are installing incorrectly. However, no errors are evident until WPI reports being finished installing. I am not installing Office 2007. It is not even in the config file. Office 2003 is present, though. I also have trouble when configuring WPI - despite having full access to the WPI directory and subdirectories, I get errors about being unable to write to windowoptions.js and useroptions.js. WPI is launched from [GuiRunOnce] in winnt.sif, as follows: [GuiRunOnce] "net use z: \\server\share /USER:server\username password /PERSISTENT:NO" Z:\Applications\WPI\WPI.hta config.js