After installing Eclipse (Kepler) on my Windows 7 64 bit, I had the problem, that I could not pin Eclipse to the task bar of Windows as every other program.
There were always two icons in task bar, when Eclipse was started.
In some forums outside of SCN I found this solution, which worked fine for me.
Open the eclipse.ini and add these two lines at the top of the file.
Of course you have to adjust the path, if you installed Java somewhere else.