mind you increasing a resolution would mean messing with the AR .. unless you keep the AR constant .. the movie will be stretched out..
ALSO most importantly if you think increasing the res would mean improving quality.. you have been living in dark.. increasing res wont increase quality but only increase the size of the file which does not translate to a increase in quality..
IF increasing quality was your aim then.. my friend get an original and i mean THE original DVD +9 of that particular movie and then use the proggie called dvd decryptor.. in case you run into trouble .. i am here to help you