I have Lenovo R60 laptop (9458-A18) with 1GB RAM, 80GB 5400 RPM HDD and windows XP Professional with SP3.Recently i have update 4GB RAM. In BIOS it showing 4GB RAM, but in XP system properties it showing only 3GB RAM installed. My laptop have 945GM chipset it support upto 4GB RAM and windows XP 32bit will support upto 4GB RAM. But it displaying 3GB only. Is there any solution to rectify this problem. one more question currently i am having 80GB HDD with 5400RPM. my question is i can update my HDD with 320GB @ 7200RPM?