Sikuli setup won't execute

I am trying to install sikuli v1.0.1 on a new computer. I have installed Sikuli on other machines before and it works like a charm.

This time however, sikuli won't start the setup.

As usual, I copied the setup-file into a folder on the desktop and then executed the file to receive the "runSetup" file and the log, which worked just fine.

However, when I execute the runSetup file, the cmd-window briefly appears and closes almost instantly with no further window opening as I am used to...

Does anyone have an idea to solve the issue?

I am trying to install on a windows 7, 64bit (just like all other computers, where I have worked with Sikuli)

Thanks in advance!