stuck at windows loading screen

ok so when ever i turn on my comp it get stuck at windows xp loading screen. i have tried to restore it with my norton goback and it only lets me restore like a day earlier if i try any earlier it fails and reboots but the other day it let me restore and it worked fine every time i turned it on but now its back to getting stuck at loading screen, ive check all my wires and everyhthing is all secure and fine i just dont know why it wont load ive left it on for 2 days at the loading screen and it didnt do anything. it wont even let me in with safemode so idk what to do im thinkin about reformatting but i dont want to >.<