Did you read the prior reply? Connect the AVRISP MKii to the Uno, plug in your blank chipBoard must be powered from USB, or from Barrel Jack/wallwart. Then:Tools: Board: Arduino UnoTools: Programmer: AVRISP MKiiTools: Burn Bootloader
The PC should recognize the MKii being plugged in.If not, do the New Hardware install thing or Linux equivlent and use the drivers provided with Arduino, my path is:c:\\arduino-1.0.1\hardware\tools\avr\utils\libusb\bin(might have the slashes backwards there)You do have avrdude installed if you have the IDE running.Yes, can burn & re-burn to your hearts content, up to 10,000 times or maybe 100,000 times, I don't remember the number in the datasheet.I'd start with the MKii driver.
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