Please make sure you have installed the
Required Patch if you are running Vista or later (MS-W 6.x). MS does not normally distribute this patch, but it fixes important problems in the OS.
Please check that your
security software is not interfering with JD or Java.
If JD will not start at all, follow the directions under
JD Hangs, Freezes, Doesn't start.
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If any program stops working after uninstalling another program (such as uninstalling Quicktime), parts of the program were not uninstalled. This is almost always the case with antivirus programs. It is a good idea to use an uninstall-sweep program such as Revo Uninstaller to do the uninstall (it does the uninstall, then checks for leftovers).
There is usually a cleanup program available at the products support site. This is almost always necessary for programs that put hooks into the OS (such as an antivirus).
You will probably have to run a registry cleaner. I recommend Glary Utilities ([glarysoft.com). Just running a registry cleaner and restarting the computer should take care of the Quicktime uninstall problem.