Just a short update:
Now CrypTool runs fine with all the included demos and stuff.
How did I get there:
I installed Internet Explorer 7.0 into the winxp bottle. Then installed the Java Runtime Environment 6u20 (offline installation package) into the same bottle.
After this I installed the latest version of CrypTool.
One minor flaw still exists:
When you want to run a demo from within CrypTool, the demo animation package starts, but has no file loaded. So you'll have to manually load the appropriate file from the install dir of CrypTool.
Take a look at the screenshot section.
-Dino