My Compaq compter was shutting down and rebooting itself while I was using it.. I took it in to be fixed. They said it "Random reboots and BSOD cause by defective 1GB RAM. They took it out and said my computer is still under warranty and that you would send me another 1GB RAM. It was purchased during end of June or July 2010. My model # is CQ532OY Product # AYi38AA # ABA Serial # MXXO161BTI Compaq Presario What do I need to do to replace the 1 GB RAM?

First - re-seat the hard disk and reboot the computer. If the computer does not boot up then reboot and go into the BIOS configuration to see if the BIOS detects the hard drive. If it doesn't detect the hard drive then it could be faulty.
Then the hard drive needs to be replaced in the computer/laptop, Windows installed and the computer or laptop's device drivers plus your programs etc. to get a functioning computer/laptop again.

Hello

First of all press ALT+CTRL+DEL and start Task Manager, there is probably some application (or other process) that is not reponding. You can kill them to let the shutdown continue, and know what is causing the problem and maybe find an update for it.

Also this means that your computer has not been rebooted properly since the installation of important system updates. If you have "Automatic Updates" scheduled on your machine, these updates could have downloaded and installed without your knowledge. To fix this issue, let the updates finish installing, reboot and then shut down your computer as normal.

Click "Start."

Click "Windows Update." Click "Install Updates" to begin the installation of any updates that have been downloaded to your Compaq Presario. When the "Restart Now" button becomes available, click it once. Your Compaq Presario will shut down Windows, finish installing the updates and then reboot your computer.

Click "Shut Down." Because the updates have finished installing and have been installed properly, your Compaq Presario will now shut down normally and will not immediately boot back up.

is the processor fan spinning and dose it get to full speed because it sound like its over heating and shutting down

try and format the primary disk and go for a new installation of the OS,or reinstall the OS by using a bootable disk

Your harddrive is starting to go. You will need to replace your hard drive. When you computer starts running slow then it reboots itself is because it is trying to get itself to work properly, but the hard drive is not operating at full capacity. I would back up all of your files as soon as you can onto either a CD or a flash drive, to save yourself from very costly repairs if you need to have the data extracted from the hard drive

CHECK THE HARD DISK

At what point in the bootup process is this happening? Can you provide more details on what the BSOD (blue screen of death) reads?
Try rebooting, and hold down the F8 key while it is rebooting. You should now have the option of starting in Safe Mode with Networking. If you don't get a BSOD, then there was a file, program, driver, etc., that caused the issue. You can also boot in Safe Mode with Log(?, I'm not 100% sure of the name, but you should be able to spot it), and what that will do is show you what is being loaded and at what point the failure occurs. That shoud narrow down the cause of your problem. Once you have removed the problematic file, program, driver, etc., you can reboot, press F8 and boot in Normal Mode.

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Recovery SettingsOne of the things that is quite different about Windows XP compared to Windows 9x (9x is shorthand for Windows 95, Windows 98, and Windows Me in all their various versions), is that one can control how it responds to certain critical errors—those that cause the infamous Blue Screen of Death (BSOD). In Windows XP, the default setting is for the computer to reboot automatically when a fatal error occurs. If that fatal error only occurs when you're shutting down, the system reboots automatically.
If you haven't changed any of the system failure settings, you should be able to see the error by looking in the Event Log. But a better long-term solution is to turn off the automatic reboot so you can actually see the error when it happens—chances are it will tell you enough about itself to let you troubleshoot further. To change the recovery settings to disable automatic rebooting:
1.
Right-click My Computer, and then click Properties.
2.
Click the Advanced tab.
3.
Under Startup and Recovery, click Settings to open the Startup and Recovery dialog box.
4.
Clear the Automatically restart check box, and click OK the necessary number of times.
5.
Restart your computer for the settings to take effect.
Now when you go to shut down and a fatal error occurs, you'll at least see it and it won't cause an automatic reboot. You still have to sort out what's causing the problem, but that gets us to the next section quite nicely.

When you start your laptop, press F8. You will get a menu (Normal boot, Reboot...). Choose Last good known configuration (something like that).