arduino 0018 dont upload

hi al, i have a Arduino Duemilanove (Atmega328) but i cant upload anything

when i click on upload see i this error.

avrdude: ser_open () can't open device \. \COM3'': acces is denied.

avrdude: stk500_getsync() : not in sync: resp=0x30 avrdude: stk500_disable() : protocol error, expect=0x14, resp=0x51

and the are only 2 leds on.

Have you selected the correct board?

Have you gone through the Troubleshooting Guide? http://arduino.cc/en/Guide/Troubleshooting

yes i have selected te correct board.

but dont see A green led if i have the usb in my computer. on my computer is the usb not hereconized. with the newest drivers, no succes !

i have tryed another operating system but no suc6. and yes i have seen the troubleshooting guide.

avrdude: ser_open () can't open device \. \COM3'': acces is denied.

This indicates another application has the serial port open which interferes with uploading.

but dont see A green led if i have the usb in my computer. on my computer is the usb not hereconized. with the newest drivers, no succes !

That could be a problem with the USB port, the drivers, or the board.

i have tryed another operating system but no suc6

On the same computer or a different computer?

Have you tried a different USB cable?