I just recently installed the PyDev 2.6 plugin for Eclipse (I run Eclipse SDK 4.2.1) and when I try to configure the Python interpreter to the path: > C:\Python27\python.exe , it gives me an "Error info on interpreter" and in error log it says: 

com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: unvalid Byte 2 of the sequence UTF-8 of 3 bytes

I have read other similar questions on this website about the same issue but the solutions do not suit my situation, as I don't have any unicode char in my path. I run Python 2.7.3. I would really appreciate any help or advice on how to solve this issue, as I would really love to start coding Python in Eclipse soon. Cheers.
I've faced same problem. The solution was reinstalling Aptana (or Eclipse, tested also on Kepler 4.2.x).
The source of problem was in path to your eclipse/aptana installition. I think that trouble here is determined by diacritic symbols in your name 'Andres Diaz', according to your username here))) (my case is: cyrillic username and user's home folder 'Михаил' in Windows8). Path to your python interpreter does not matter here.
The cure is: move/reinstall your Eclipse to folder with the path which does not contain any non-acsii character. In my case I've moved Aptana Studio from C:\Users\Михаил\Aptana3 to C:\Aptana3 and (maybe it's not necesarry, I don't know) its' workspace also to root C:\ folder. 
P.S. I think it can be useful for those who also faced such problem cause I was not able to find any answer about how to solve this troubles but a lot of similar questions.
P.P.S. Sorry for my English, languages are not my leading skill)))
Error when configuring Python interpreter for PyDev in Eclipse