Search the Arduino folder for a file named "avrdude.exe" - should be in a folder like hardware-tools-avr-bin. Seach the net for "avrdude GUI" or "avrdude-gui.exe" and find an exe program like that - there are several and quite similar, download and try some of them. To run that, put them in avrdude.exe folder from arduino subfolder, and run from there. It should provide a stand alone interface from which would be easy to set: com port & programmer & atmel chip and then erase the chip. Without the "gui" program you would have to write all those settings from command line. On short, try erase the chip one more time, with right settings. See what kind of error it gives then. The error perhaps should be something different than initialization, if all the settings are correct.
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