Hi, last night my computer said that my memory is low here is what I did to try and fix the problem:

clicked on Start
clicked on control panel
clicked on system
clicked on advanced
clicked on settings under performance
Performance option window pops up
I switch it from "let windows decide what is best" to "best for performance"
in this same window i clicked on Advanced and there i changed my memory usage from Programs to system cache
i then restarted my computer as instructed.

now the real problems begin
I have a 2006 sony vaio laptop with Windows XP

no matter how many times i try and reverse I've done, the computer will not let me.
I've tried rebooting and doing safe mode. When trying safe mode I got this,
a screen full of: multi(0)disk(0)rdisk(0)partition(2)\WINDOWS\System 32\DRIVERS/CLASSPNP.SYS

after the last slash the letters are different on each line like, one has Mup.sys

i've tried system restore as well

Welcome aboard

Please, observe following rules:

• Read all of my instructions very carefully. Your mistakes during cleaning process may have very serious consequences, like unbootable computer.
• If you're stuck, or you're not sure about certain step, always ask before doing anything else.
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• Never run more than one scan at a time.
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The most common cause is the executing PnP (Plug and Play) and ACPI routines issue.
To fix the issue, we need to access the computer from Recovery Console.

1. To start the Recovery Console directly from the Windows XP CD you would do the following:

• Insert the Windows XP cd in your computer.
• Restart your computer so you are booting off of the CD.
• When the Welcome to Setup screen appears, press the R button on your keyboard to start the Recovery Console.
• The Recovery Console will start and ask you which Windows installation you would like to log on to. If you have multiple Windows installations, it will list each one, and you would enter the number associated with the installation you would like to work on and press enter. If you have just one Windows installation, type 1 and press enter.
• It will then prompt you for the Administrator's password. If there is no password, simply press enter. Otherwise type in the password and then press enter.
• If you entered the correct password you will now be presented with a C:\Windows> prompt and you can start using the Recovery Console.

2. Type map and press enter.
It will give you the drive letters.
Note down the letter of you CD-ROM.
If it is a letter other than E you should replace the letter E with your CD drive letter when applying the expand command later on if the command is needed to be applied.

Type following commmands, pressing Enter after each one.

• ren c:\windows\system32\drivers\atapi.sys atapi.old
  (It will returns to the prompt again without notification)
• copy c:\windows\servicepackfiles\i386\atapi.sys c:\windows\system32\drivers
  (If you get a notification "1 file(s) copied" you don't need to do the next expand command and go to exit command. But if you get notification that the file doesn't exist proceed with expand command)
• expand e:\I386\atapi.sy_ c:\windows\system32\drivers
  (You should be notified that the file expanded)
• exit

You may remove the CD or let Windows boot normally.

Thank you, but as far as i know i do not have the CD. Thats my problem, i have been trying to download it for days now, but my moms computer (computer im using) does not have the right software to use the downloads so i can burn it onto a CD. I will ask other family members if they have the CD.

You can't download Windows. At least not legally.

If you don't have Windows CD...
Download Windows Recovery Console: http://www.thecomputerparamedic.com/files/rc.iso
Download, and install free Imgburn: The Official ImgBurn Website
Using Imgburn, burn rc.iso to a CD.
Boot to the CD...let it finish loading.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Then, follow steps from my previous reply, starting at:
"The Recovery Console will start and ask you which Windows installation you would like to log on to........"