avrdude: ser_open(): can't open device "\\.\COM1": can't open device.(and in effect:)avrdude: ser_drain(): read error: invalid path.
Hi,here is my situation - I got my first Arduino(Uno) last week. I successfully uploaded and ran quite a few programs on it. Only today when I connected it to my computer, I got this error-avrdude: ser_open(): can't open device "\\.\com3": the system cannot find the file specified.... The "port" under tools menu is grayed out, even with the board connected. It used list COM3, if I had the board connected before. Now I can't find the Arduino in the device manager either!I was working on an obstacle avoiding bot, and I uploaded a code for it last night. When I connect the Arduino to my computer, the power LED glows and that code runs. I wanted to change the code a bit tonight, but couldn't because of this problem.I am running 64 bit Windows 8.1. My brother has the same OS. After some frustration with this, I connected the Arduino to his laptop for the first time only to get more frustrated - its the same problem there. No drivers start getting installed, the device manager doesn't show any new devices. It's as if the computers don't know if anything got connected to them!I hope I could make my problem clear. Any help would be greatly appreciated. As I already said, this is my first Arduino, so you can assume I have virtually no experience with micro-controllers before.