try bumping up your voltages a tad. (RAM/CPU/FSB) it might help. BUT it could be something totally different. so i would await the help of others unless you have room to spare in the voltage area. or you could just down clock some too.
I think I posted a link like this in the other thread. You should probably rebuild your boot.ini. You can do this using the recovery console. Take a look at this article:http://www.computerhope.com/issues/ch000648.htm