Windows xp sp3 on intel core i7

my computer is stuck in a reboot loop. I have an intel core i7 desktop computer. it is windows xp professiona sp3. the problem happened after I installed the windows service package 2 (i know, im a little behind). it seemed to install the update fine but after I restarted my computer I couldnt seem to get to my desktop. the computer manages to get to the light blue windows xp loading screen but instead of entering my desktop the computer reboots and the whole process starts over again. after reading other forums, I tried the F8 method but couldnt seem to make it work. last known configuration and safe mode dont seem to work .
what should I do?