Eclipse won't start

I install eclipse in a windows xp professional x64 edition pc(I delete the old folder)
I have java vm installed in c:\\program files\\java\\jdk1.6.0_13\\jre\\bin\\javaw.exe

When I run eclipse, it starts a few second then stops. From Windows Task Manager, I can see that eclipse and javaw start and go.

What happens? any help? My CPU is Xeon(R) E5430 @ 2.66GHz, 8G RAM


thanks