Vldo,
you know, this is only necessary because to burn the bootloader using IDE is not working for you.
But I think you are making mistakes yet.
Look:
When clicking Start/Programs/Acessories/DOS Prompt, the black window will show you this:
C:\>
or some other prompt, like this:
C:\WINDOWS\>
Then, you must type (or copy/paste**) the FULL line command, in ONE Dos Prompt line:
C:\Program Files\arduino-0011-win\arduino-0011\hardware\tools\avr\bin\avrdude -CC:\Program Files\arduino-0011-win\arduino-0011\hardware\tools\avr\etc\avrdude.conf -v -v -v -v -pm8 -cdapa -e -Ulock:w:0xFF:m -Uhfuse:w:0xca:m -Ulfuse:w:0xdf:m -F -b115200
Then Press
Your mistake was typing the command line divided in TWO Dos Prompt lines. That's why it didn't work.
** to copy (the command line above) you can select all line and use CTRL+C or click with the mouse right button. But to paste inside the DOS Prompt black box, the CTRL+V will not work. You must use the mouse right button, to select "paste".