I managed to install OSB 188.8.131.52 with OEPE 11.1.16 (oepe-helios-all-in-one-184.108.40.206.1.201010012100-win32.zip) on win7 64-bit. My default JDK is 64-bit. When I fire up Eclipse, I'm getting this "Failed to load the JNI shared library ... vm.dll" error.
Solution is to install JDK 32-bit, then update eclipse.ini to point to your 32-bit JDK. here is the snippet of the .ini file. Keep in mind "-vm option needs to split on 2 lines, and appears before vmargs" (see http://wiki.eclipse.org/Eclipse.ini)