Newbie here: first time using arduino and can't upload Blink sketch

Arduino IDE is saying this: "Binary sketch size: 1018 bytes (of a 30720 byte maximum) avrdude: stk500_getsync(): not in sync: resp=0x30 avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51"

But I also think my driver isnt properly installed. The device manager says "The drivers for this device are not installed. (Code 28)

There is no driver selected for the device information set or element.

To find a driver for this device, click Update Driver."

How do I fix this ? I followed the instructions Using a Sony VAIO with Windows 7 and an Arduino Duemilanove

Just followed this http://arduino.cc/forum/index.php/topic,76898.0.html and it works