G'day, ok just wondering what c:\windows\system32\drivers\serial.sys is for? On my sons comp xp-home sp2 under non- plug and play devices he has an exclamation mark in yellow circle. the message in the properties is "this device is not present. is not working properly, or does not have all its drivers installed (code 24). The only problem he is having comp wise is with his netgear wifi usb adaptor. Takes about 30 min and several restarts to get a signal. Once he finally has a signal works perfectly. This has been a problem for about 3 weeks, worked perfectly since we had it (7 months). Just curious about serial.sys before i do anything. Have been googling but cant find a straight up answer. any ideas?