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I also have a special version Cube Explorer 4.54s available, which uses more than 2 GB of RAM for the huge optimal solver tables. It is about 15 times faster than the standard optimal solver and optimally solves a random cube in less than two minutes on average on a 3 GHz machine.

Only Windows XP Professional or Server Versions of Windows support a virtual address space of more than 2 GB for an application. Even with these versions you have to use the /3GB switch in the Boot.ini file to support more than 2 GB of RAM for an application (see here for details).
If you have at least 3 GB of RAM installed and use Windows XP Professional or a Server Version of Windows, you may want to download this special version here.

Download Cube Explorer (753 kb)

If you are interested in an Optimal Cube Solver in the Quarter Turn Metric which runs on the command line under LINUX and WINDOWS, you can download the documented C source code here. An already compiled version for Windows is available here. The program also accepts the file format of Cube Explorer, so you can generate your cubes in Cube Explorer and feed them to this program