New hard drive, clean install of Lion, but MacBook Pro is still freezing

Hi everyone,
Even the folks at the Apple store don't seem to know what's going on with my MacBook Pro.
My hard drive crashed a few weeks ago. I bought a Western Digital Scorpio Blue and replaced it myself. The MacBook didn't seem to like it (lots of freezing, going really slow, etc) and so, after reading online that many MacBook Pro users did not like the WD Scoprio Blue, I returned it and bought a 320 GB Hitachi. Before replacing the WD drive with the Hitachi drive, I used SuperDuper! to make my external hard drive a clone of the WD hard drive. I replaced the WD with the Hitachi, booted from the external, and then restored all my stuff to the Hitachi. The computer still didn't work so well, so I did a zero-out erase and a clean install of Lion. I dragged my files over individually (only about 100 GB of word documents, music, and photos). For the first two days, everything worked perfectly. Then I started getting these error messages:
Word: Word cannot save or create this file. The disk may be full or write protected. Try one of the following. *Free more memory. *Make sure that the disk you want to save the file on is not full, write-protected, or damaged.
Chrome: Your profile could not be opened correctly. Some features may be unavailable. Please check that the profile exists and you have permission to read and write its contents.
Dragging files to trash: The operation can't be completed because an unexpected error occured (error code -50).
Fireforx: Close Firefox. A copy of Firefox is already open. Only one copy of Firefox can be open at a time.
In addition, the computer kept freezing. I also had problems with Mail and iTunes. Disk verify, permission verify, S.M.A.R.T. utility all said that the hard drive was working fine though.
So, I brought the computer to Apple. They did a zero-out erase, reinstalled Lion, and did what they called a "software repair". They said it should work fine. I just got home from the store, booted up the computer, and it's barely working. All sorts of error messages, safari won't work, it keeps freezing, and I was only able to open disk utility once. I verified disk, and it came up with no problems. I verified disk permissions, and when I tried to repair disk permissions, it kept saying it was "unable" to.
I don't know what it could be. It's not the hard drive...I've run disk utility, S.M.A.R.T., and an app that checks the hardware associated with the drive. All of these programs say the hard drive is absolutely fine. I've also reset PRAM. Another thing worth noting is that I'm currently booting/working off of my external, and it works absolutely perfectly.
Any ideas? One of my friends suggested I go back to Snow Leopard, but I don't see what difference that would make. Please help! Anything would be very much appreciated! Thanks!!

The theory is that you have a weak bit in one of the modules, and sometimes (rarely) it flips over. The trick is to try and catch it.
If you move the modules, the weak bit will be at a different Address in memory. Different things will be loaded into the word with the weak bit, and the symptoms may be different.
It may not do anything at all. But it is so easy to try, it is worth a shot.
On a multi-module memory, you need to keep your wits about you when doing this, or you put them back the way they were originally. So you should pick a direction and always move them your "regular" direction.

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