I tried out some of the beta's but there still not full functionality and the SB External just doesn't work right with W7 and REW. I am just going to stick with the older XP laptop for now, just worried the screen might go out completely since there are a lot of dead pixels on it.
You can run REW just fine on a W7 computer, it is the discontinued SoundBlaster Live External that's the problem. I bet there is another more computer savy user who can figure it out.
My problem was I was unable to calibrate the sound card correctly due to the level's being too far off. Since I was unable to open the proper window for the SB Liver External I couldn't raise or lower the level for the calibration. I kept on getting error messages saying that it was not compatible with my version of windows even after the beta.