WindowBlinds x64 seriously broken

I have been using WindowBlinds for ages on 32 bit Windows, and a couple of weeks ago I moved to a brand new Vista x64 laptop. Now I have spent a week troubleshooting the most bizarre problems, and finally nailed it down to WindowBlinds (6.3). With WindowBlinds loaded, I get the following problems:

• I cannot load or install any virtual machines in VMWare. I constantly get error messages saying that it cannot access the vmdk file.
• I cannot use more than half of the available RAM. When aprox 50% (2.5 out of 5 GB) of my available physical RAM is occupied, I cannot start any more programs or invoke new functions in loaded programs. Error message: There is not enough memory to load the program.

With WindowBlinds turned off, I have none of these problems.