Oliver, your Crucial RAM is a very good brand.
There is quite a good chance that you are a teensy bit low in your voltage settings.
You might be, or you might not be. Consider the following, and see what you think.
First of all, go to the Crucial site and just check your exact RAM for its rated voltage. Um—write it down. (The tiny adjustments tend to make people forget.)
Then go to into your BIOS, likely by pressing DELETE as the computer comes on.
Be careful. Look around until you see something to do with DRAM settings, which probably show AUTO beside them. You can highlight AUTO and press ENTER—it will be something like this; use your imagination a bit—and then you can set your voltage settings to MANUAL.
Within that section, there are several suspects.
— Your DDR2 voltage settings might want to be upped a bit.
— Your NB (Northbridge) settings might likewise want to be upped a bit.
Be conservative. Don't go into any red-lettered settings. See if you can set your RAM to match its Crucial rating.
I'm suggesting that you be making changes between +0.100 and +0.300. Probably just +0.100 to +0.200. Okay? (My guess is that you might not get any more blue screens even if you merely upped your DDR2 by +0.100 and did nothing else to anything else.)
Higher voltage settings may reduce the lifespan of your CPU, but not so you'd notice. Moreover, if your default settings are too LOW, that is hard on your system too.
Okay: are we having fun yet?
Also notice you have Trfc settings. These may also be at a default AUTO setting. You don't need to change these YET, but sometimes they are set too "tight" and you need to relax them a bit. So, with Trfc settings: LOWER numbers are FASTER and are said to be TIGHTER. That is nice if your system can handle it. If your system seems a bit quirky or unstable (crashes, bluescreens, or freezes) you MIGHT (not necessarily; it is just a possibility) want to go for a HIGHER number, which is SLOWER and we say LOOSER.
You won't notice the difference in speed, but you will notice the difference in system stability.
RAM by itself does not technically increase your computer speed. RAM allows your system to handle a bigger workload and the result can be greater speed. You have likely done well to buy the new RAM, and Crucial, as I said, is good RAM.
Friendly advice: Speed slowly. You are doing better than you realize. Your system is complex, and there are many causes and effects happening. Be careful not to jump to conclusions. Ideas such as the voltage concepts I've suggested are simply SUGGESTIONS, and you need to carefully test them to see if they help or not. Be slow to form any conclusion at all.
Have fun, and good luck.