System extension cannot be used

Hello, my name is Annastasia & I am having an issue with my Mac. A little info about it (in case it helps at all):

Mac OS X
Version 10.6.8
Processor 2.2 GHz Intel Core i&
Memory 4 GB 1333 MHz DDR3
Startup Disk Mac Intosh HD

Model Name: MacBook Pro
Model Identifier: MacBookPro8,2
Processor Name: Intel Core i7
Processor Speed: 2.2 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 4 GB
Boot ROM Version: MBP81.0047.B27
SMC Version (system): 1.69f3
Serial Number (system): ************
Hardware UUID: ********-****-****-****-**************
Sudden Motion Sensor:
State: Enabled

Here's the problem:
On my Mac, I got this message on my screen as a pop up & when I click OK, it pops right back up in the middle of my screen.

The system extension "/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/DspFuncLib.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.

The system extension "/System/Library/Extensions/AppleHIDKeyboard.kext/Contents/PlugIns/AppleBluetoothHIDKeyboard.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.

The issue I was having before this popped up was in Finder under places where it would normally say:

(picture of a desktop) Desktop
(picture of a house) Annastasia
(an A made of a work supplies) Applications

my name next to the picture of a house disappeared. All of my applications & folders from my desktop are gone & I cannot access any of my music, pictures or data.

I went onto another account on my computer. The data there was unaffected & worked perfectly. I went into System Preferences, then to Sharing, then to File Sharing. From there, I clicked on each Shared Folder & set it to "Read & Write". Then I clicked on each user (System ...nistrator & Administrators & Everyone) & I also set them to "Read & Write".

Note: Also on the File Sharing page under sharing, if you click on "Options", I have this box checked:
Sharing files and folder using AFP

I do NOT have selected:
Share files and folders using FTP
Sharing files and folders using FTP

Any ideas on what I can do to fix my (picture of a house) Annastasia & to get everything back in my desktop & my data back where it belongs??

It sounds like that first administrator account is corrupt. Since you're able to access everything normally using another account, it's probably best to copy what you need over to the account that's working OK and then remove the corrupt account. Make sure though that the new account is working OK and you can sign on to it. Also, it's best to backup everything using Time Machine before doing the above.

chscag said:

It sounds like that first administrator account is corrupt. Since you're able to access everything normally using another account, it's probably best to copy what you need over to the account that's working OK and then remove the corrupt account. Make sure though that the new account is working OK and you can sign on to it. Also, it's best to backup everything using Time Machine before doing the above.

Click to expand...

I COULD access all the other accounts until my computer crashed. When I started up my MacBook pro normally by clicking the power button just after it crashed, the apple symbol appears on the grey screen, and then is replaced by the “no” or “prohibition” symbol (circle with a diagonal line through it), and it's stuck there endlessly.

It goes quickly back & forth as fast as a strobe light between these three characters:
1: help! Mac OS X Grey Screen | Flickr - Photo Sharing!
2: http://tinyurl.com/cm2lez8
3: http://tinyurl.com/8xzjeu8

I then here three loud beeps which I read means "no good banks". I also read that this mean the ram isn't sitting properly.

I tried the SMC Reset (holding power butting for 5 seconds, releasing the power button & then attaching the power cable & last pressing the power butting to turn on the computer) but it just went back to beeping again.

Starting up my computer in single-user mode didn't work either. I tried starting the Mac in single-user mode by turning on the computer & then pressing the power button to start the computer. I then immediately pressed & held the Command (Apple) key and the "s" key for single-user mode. (Command-S)

The Pram Reset didn't work (this is when you shut down the computer, press command, option, P, R. I waited for the computer to restart but it never did. I tried about 20 times & my boyfriend tried about 50 just to make sure we were doing it right. This failed as well.

I also tried verbose mode by turning on the computer & then immediately pressing & holding down the Command key & the "v" key for verbose mode. At this point to exit single-user mode, I would have needed to type reboot & then pressed enter. But what ACTUALLY happened was that the it was black with some white lettering & I could not type.

I then thought it might be that my Open Firmware Password Protection was enabled. When this is enabled, you can't access single-user or verbose mode.

I tried another way of resetting the PRAM. This way had me hold down command, option, P, & R. I kept them down until the the third startup sound. Doing this should have disabled the firmware password protection. After this process, I tried the verbose mode again with no success. Just for kicks, I redid this type of PRAM process & tried command-s.

QUESTION: Is there any way I can make it so I can type in the terminal when it opens? How can I type in terminal when my mac is stuck on grey screen?