Sorry,
about the sketch not uploading on DOS sometimes, was my fault. I didn't press reset. 
And the uploading sketches on IDE was my fault too. I removed the "arduino-0010-win" directory
keeping only "arduino-0010". That was causing the error 193.
I didn't thought this could be a problem because I removed the 0007 directory too, and it is still working. But now I understand there's a difference using uisp or avrdude (java).
So the only remaining problem is bootloading with IDE(perhaps including -F and removing -i can solve it).