USB Ports Not Working in Acer Laptop

Hi,
I just bought an Acer Aspire One Laptop that I have an Operating System reinstalled from Scratch. After restart, the mouse doesn't work when I plugged it in to the USB port and also the Keyboard is not working. I realized that my USB ports are not working. It should work by default even without drivers right?
Do I need to install a driver for it?
Thanks.
