Just thought I'd post this up, as I've had a few issues putting Gantt chart software onto a suite of Windows 7 x64 PCs.
First, install JRE (I hate it, but it's needed for alot of this stuff)
This is available as an MSI, but I've found the newest version would not add as a deployed application, so I used an older one.
Once this has been rolled out with Group Policy software installation, you may find it doesn't work properly, this is due to jscript.dll not being registered in syswow64, so run this as a startup script, extension .bat:
REM --- register 64bit jscript.dll
Now JRE should work fine. I have blocked jucheck.exe site wide to get rid of the update notifier too, but you may not wish to do this as Java's not particularly secure!
To install Gantt, put the .exe in a network installation folder (don't use your sysvol for this!) It's no longer available as an MSI, unless you want to package it yourself.