i cant get vistax32 to boot to normal windows

ok here is my problem ....i was playing world of warcraft on sunday then my pc froze and locked me up had to reboot it tried to log onto world of warcraft again 5 min later it froze kicked me out again after it froze again and i rebooted i checked my vga card see if i needed to upgrade my driver i found out it needed a new driver then re-booted then got a message "Not supported mode" would not boot up so i restored before i updated driver to get to desktop again now my pc keeps wanting to do a chkdsk on every re-boot then after it runs says its clean then locks up pc again now it wont even do it chkdsk now just wont load to normal windows only will load in safe mode so im trying to find out why my pc loads in safe mode only not normal mode specs on pc is AMD athlon 64x2 4600+ 320 g hd nvidia gt 8500 graphic card...i cleaned inside my pc found it had alot of dust in there not sure if i had over heated something in there that might be issue of it not booting normally