Welcome to the forums.
There is no *easy* answer for this. To OC (overclock) is an art. The way one machine reacts to an OC is different from every other machine.
The blue screen is no doubt because a piece of hardware is failing under the increased speed of a 147 fsb. You can try to increase the voltage the the CPU and/or memory. Of course, if you do this, you need to cool those items because they will generate more heat and heat can make parts fail. It could be that your vid card and/or IDE channels can't handle the fsb. You can see if your board allows you to lock those down.
There are many many ways to go to fix this problem. I would suggest that you use the "Search" feature within these forums to find answers that will work for you.
Good luck and happy hunting.