Be careful,don't split too much memory to graphics aperture,because they will share your physical memory with OS,if you have 512M memory,you share 128M to graphics ap ,there will be only 512-128M memory avaliable for system use.
The best way is don't set your screen resolution too high,down it from 1280X800 to 1028x768 or 800x600
The best way is don't set your screen resolution too high,down it from 1280X800 to 1028x768 or 800x600