Sony VAIO E Series Keyboard And Mouse Not Working?

I have purchased Sony VAIO E series three months back working without any issues. But after 2 months, the built-in keyboard and mouse not working after windows starts. USB mouse and other features working without any issues. To make the keyboard and mouse, i have should restart the system 2 to 3 times or uninstall the driver for same. The laptop having Windows 7 Home Premium. After the problem, i have reinstalled Windows 7 Enterprise and also did built-in system recover. Still the problem persists. Is the problem related to Windows 7 or with hardware? But once the keyword and mouse drivers uninstalled via device manager working fine. OS is 64 bit