If it worked with version 4.2, it probably means that your 64 bit driver is buggy, because from version 4.3, the installer installs the 64 bit version of the program on 64 bit Windows computers. If you want to run it in 32 bit mode, install Java 32 bit and run Java Web Start version or Jar executable version using javaws.exe or java.exe included in the installed JRE 32 bit.