You should match your platforms of OS, VM, SWT.
for example:
OS: Windows 7 32bit VM: JRE 7 win 32bit SWT: win32 binary
or,
OS: Windows 7 64bit VM: JRE 7 win 64bit SWT: win32_x64 binary
so, If your OS is OSX(mac), you should use SWT osx binary, not win32.