Hi I have a new SZ650. Running XP. That was a wise choice. All my software is compatible and the install disks from Sony seem to have worked perfectly BUT. The battery only charges to 80 percent. I'm sure that has to do with settings - extended batt life?? Vaio support (via chat) advised me to check the BIOS. There are no bio settings for the battery and setting 'power management off' doesn't make any difference. Can anyone help? I'd like to be able to use the full battery charge at times. Thanks PS I love this machine. I have a Dell D800 but it was getting too heavy to carry around at my age!