serial port "com 1" not found?

i am trying to use a Freeduino with an Atmega 168 on a windows 7 computer, it has been working sort off but now it doesn't work atal, when I first got it it would work sometimes and sometimes I would get the serial port not found error, I could fix this by restarting my computer, recently it happens every time I try to use it, normally the sketch just wont upload but sometimes it says its uploaded but the TX and RX leds don't flash and the sketch hasn't uploaded, I have installed the driver according to the Arduino website and when I try to update the driver it says the right one is already there? I hope somebody can help