I downloaded the Windows (I'm running Windows 7 64-bit) installer from arduino.cc (version 1.05). It ran with no complaints. It even installed the driver.
I hooked up the Arduino and the power and L1 LEDs came on and stayed on. I uploaded the blink example as per the Getting Started page on arduino.cc. I selected Arduino Uno from the boards dropdown and port 3 from the serial port drop down (The port assigned to it by Qindows). I left the programmer as AVRISP mk][. I clicked upload and eventually the Rx LED flashed three times. Then, it gave me the following error:
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Using Port : \\.\COM3
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: Send: 0 [30] [20]
avrdude: Send: 0 [30] [20]
avrdude: Send: 0 [30] [20]
avrdude: Recv:
avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude done. Thank you.
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Using Port : usb
Using Programmer : stk500v2
avrdude: usbdev_open(): did not find any USB device "usb"
I tried the BareMinimum example sketch, and got the same errors. I tried changing out the USB cable, but that didn't help at all. I tried every USB port on the computer, then started all over on a different computer. No change. I uninstalled and re-installed and Windows assigned it port 4, but nothing else changed. Finally, I uninstalled, downloaded the zip file instead of the installer, and followed the installation instructions for that. Now, the Arduino is on port 5 and Windows still thinks it's working correctly but I get the same errors when I upload.