eried:
What Louis Davis says seems to be correct. You maybe require the JDK in 32 bits. About: "AVRdude version 5.10 instead of the newer 5.11" can you tell me how to check this, I am still confused since you (or someone) commented this weeks ago.
Thanks. I'll try and install the 32-bit JRE.
To check the version of AVRdude, just run (from a command prompt):
avrdude -?
the version is the very last info shown, and with version <=5.10, the results are a bit garbled in the screen (it is neat in 5.11).