Hello. Almost two years ago, I purchased my Alienware m18x-r2 on sale during Black Friday (in 2012). For the first year or so, it ran perfectly, of course up until the point my warranty ran out.
One day, my Alienware suspiciously crashed and wouldn't reboot - not even in safe mode. Additionally, I was unable to restore to a backup, and so I was royally screwed, losing all of my documents. I ended up re-installing windows and doing a complete wipe of this computer. I then learned that my "M18XR2_RAID1" is completely messed up, though I'm not really sure what this actually is? At first, both Ports on this Array (excuse me if I'm using the wrong terms here, I'm guessing based off of what Intel Rapid Storage Technology is showing) were messed up, and both of them were "rebuilding." This is what was happening when I couldn't restart my computer originally, after the initial crash. Since then, "Port 0" has rebuilt and is all fine and dandy, but "Port 1" is in a constant state of "Rebuilding." Every now and again, it finishes "rebuilding" and it says something along the lines of "at risk." and there's a button to press that will reset it to normal. About 5-10 minutes later, the "at risk" thing comes back, and the reset to normal button is also back. Here's a picture of what IRST is showing at the moment: http://imgur.com/lpug4o3
Since this initial crash, my Alienware blue-screens/crashes multiple times without notice, and is very clunky/slow feeling compared to what it was when I first had it. Additionally, playing games such as League of Legends, DotA2, Diablo 3, and Call of Duty, I've been experiencing many FPS issues and moments when the game will just completely freeze for a few seconds before returning back to normal. This never used to happen when I first had this computer. Everything used to run perfectly! 
Things I've done so far:
-Completely re-installed windows.
-Update all of my graphics drivers.
Sorry if some of what I've said isn't completely clear, I don't know a lot about specific parts of a computer/what they do, etc. I would appreciate any and all help - I really want to be able to use my computer without it crashing randomly, 24/7! Thanks in advance, and please let me know if you need any specific information. This is my first time posting on any forums asking for help with these issues, so I'm not sure what information I should include. Anyway, thanks again!
-Alex