I downloaded and installed Parallels 4 for use on a MacBook Pro running 10.6.1. The first problem was the process to install the tools never appeared to complete even though I was able to open Windows albeit in a small window, which leads to my first question. Can I not open Windows on the full desktop? I only see a window about half the size of the screen. I let the tool installation thing run all night and finally Force Quit this morning. Before I did I opened Windows and other than the fact that it was in a small window and ran slowly, it seemed to work. I then closed it and opened again but cannot get past a black screen with a message saying it cannot connect to Hard Disk 1. The only option is to quit. Is all this because the trial is not Snow Leopard compatible or something else?