Not sure if this was the solution to Babuibf's problem of installing Mepis when it stalls prior to the log in screen, but it did solve what seems to be the same problem for me. (Now don't get uptight about referring someone to another another forum!!!) I downloaded the 64bit version referenced in the sixth reply down on this forum:
http://mepislovers.org/forums/showthread.php?t=15866
Ken