can't recognize hd/screen freezes

My system crashes. Sometimes when I boot it does'nt recognize my hd. Sometimes it won't detect my disk drive. I started by checking for spyware. I then replaced my motherboard. Next I replaced my hard drive and reinstalled windows. I have no idea what to do next? I just reinstalled windows again. Right now I'm running another spyware program(super anti spyware), ive had luck with that in the past. Any other ideas?

When you reinstalled was it a clean install (did you format)? If not try that method. If you did a clean install it is a hardware problem.

It was a clean install. Was actually a new hard drive. But I did have my old hard drive as the slave and I also transfered some pictures, videos and some music from my old hard drive after the install.

Go to search
Type device manager
In device manager look at all the drivers, make sure they are up to date. Look for any small yellow markers that indicate problems.

I did that with the old hard drive. I will do it again and see what happens. I just got through testing my memory and that does'nt seem to be the problem. There is no way it could be the gpu? that's really the only thing I have'nt tested or replaced.

Im not there so I can just guide you. If you did a clean install, it cant be the Operating System, it must be hardware. Here is an analysis of hardware problems.
Stop 0x124 - what it means and what to try - Windows 7 Forums
Look at the document, try all that you have not tried already.