Im having the same problem as above. Same setup also Win 7 64 bit SP1.
The only way Ive barely been able to use it is hit CTRL/ALT/DEL, cancel that, then it will work for a few seconds and lock up again. The process can be repeated.
I haven't complained because I thought it was just me and I set Escribe up on a Win7 32bit machine that works flawless.