laptop refuses to load xp?

hi i have at the mo an old packard bell easy one laptop there was an error on the harddrive saying that the copy of windows was not the original and the graphics were comming up red in places i managed to sort the graphcs out but when i went to restart the computer it keeps telling me to start at an earlier good time or start normaly . but each time i try and select one of these options it just keeps loading to the xp start up then jumps back to the error page to restart from the page i mentioned b4 is there something i`ve not done or mucked up as i also bought a newer hdd for it and it won`t even let me load a new version of xp on it can anyone give me any tips