Windows 7 Crashes and does not recognize boot drive at restart

I just built a new computer. Here is the configuration:
i7 2600k
corsair vengeance 16gb
msi z68a-gd65 (g3)
60Gb Patriot Pyro SSD SATA III
750 GB WD Caviar black
Antec BP550
HIS radeon HD 4670

Everything works fine, except that it has happened already 4-5 times in the past month that windows 7 freezes (where I cannot even access the task manager) and I have to restart using the restart button on the case. Then, when it restarts, it does not recognize the SSD (which is the boot drive) and asks for a disk boot. However, when I turn the system off and restart it starts without problems. I am running Windows 7 Professional 64-bit and I have downloaded all the latest upgrades. I also did a through Windows memory check (it took 2 days) and there were no problems. The SSD drive is almost full (2GB free) but I can't believe that is the problem. I am not sure what the problem could be. Can someone help me? I think it's a problem with the hardware more than windows but I'm not sure what to do.
Thanks a lot for your help.

 

I would put money on HD causing it. You only have 3% free. This means your system wont have space to function properly.I always aim to keep at least 25% free.

 

I agree w/ Tueur.

Although SSDs have improved in quality since the first generation, my experience has been most are still far more prone to failure than good quality standard HDDs. The best SSDs on the market are Intel - expensive, but worth it based on their very low failure rate.

I'd back up whatever you have on the 750GB drive and install Win 7 on it. If you want to keep things fast without having to worry about defragging all the time, partition the 750GB drive to 75GB for Windows, software and games; use the remainder (about 650 GB formatted) for file storage. This way, when you run a defragmenting program, you'll only have to do it on the operating system part of the drive.

Hope this helps.