Re: My PC won't start .
There is nothing in Eraser that could directly cause these symptoms, though erasing free space inevitably works the drive quite hard, and that can bring on a failure that was going to happen anyway. However, in your case, that's not my first guess about the cause. Even so, your description does makes it sound more like a hardware than a software issue.
If the message is about RAM, you may have a memory chip that has failed; presumably your machine is now a few years old. Or it could be as simple as a chip that is not properly seated in its slot. What you need is a friend who can do some on-the-spot diagnosis. The starting point for that is the precise text of the blue screen message, and in particular the long error code.
I'm sorry that, at this distance, I cannot be of more help.