I'm not running your hardware so there may be memory leak associated with your driver, I don't know. But I'm running 29 BE's on Win7 w/512MB RAM with no issues on CGMiner 3.11.
Watch out, os2, Kano is about to call you a low life because you don't use the supported hardware. Have you tried any of the other mining software? you will find much more helpful developers on ANY other mining solution.
Best of luck dealing with this DOUCHEBAG.