My p.c automatically restarts

Could you please provide me the exact error message?

However to stop the system shutdown first follow these steps.

Disable automatic system restart.

1. Restart the computer and press the f8 key to open the Advanced Boot Options menu.
2. Select the Disable automatic restart on system failure option.
3. Restart the computer to accept this change.
Then go to safe mode

This problem occurs after a memory dump file (error log file) is written by Windows XP. Because the memory dump file flag not reset in Windows XP the memory dump file will contiue to be written every time Windows is restarted.

1. Restart the computer and immediately press f8 repeatedly. Use the arrow keys to select Safe Mode and then press enter .
2. Click Start , right-click Computer , and then select Properties .
3. Click Advanced system settings , grant permission to continue if prompted, and then click the Advanced tab.
4. On the Advanced tab, click Settings

1. In the Virtual Memory section, click Change .
2. For Paging file size for selected drive, click No Paging File , and then click Set .
3. Click Yes after the following warning appears:

If the paging file on volume X: has an initial size of less than xx megabytes, then the system may not be able to create a debugging information file if a STOP error occurs. Continue anyway?
(X is the drive letter and xx is the amount of RAM installed on your computer minus 1 megabyte.)

1. Click System Managed Size .
2. Click OK four times to return to the Windows Desktop Screen and then restart.

For more information plz check the below doc from HP.
I hope this will definitely resolve your issue.
If not plz get back with the exact error message so I can give you better solution on this.
If you find this helpful then Plz vote for me..Dreamkam

sometimes it happen because you have installed a driver recently and it is creating a havoc there. try to run in safe mode and restore the configuration to the previous one.

other options, is that a memory went bad. try to read what error is telling before the beginning dump of physical memory.

if one bank of memory is bad, try running your computer with one of the banks at the time.

kernell has over run the memory....
some corrupt registries may also cause this issue...
u can try to run a registry cleaner (Tuneup Utilitis or Registry defrag etc can do the job...search in google)
else
do a clean install of OS after data backup

Hi...

There are two thing you should try..
Check the memory.
Reinstall the OS.
Thanks

Kindly rate
Smith

There are essentially two major causes of the physical memory dump screen: Running way to many programs at once, errors in the Windows registry.The first cause can be fixed rather easily. Simply run fewer programs or purchase additional RAM or processor upgrades. Your computer is running past its specified limits. But keep in mind the blue screen of
death should happen very infrequently. If you see the physical memory dump blue screen more often then the problem is errors in the Windows registry.This is a more abit of a harder problem to deal with. The registry is the most important component of your computer. The registry contains settings and information to run all software and hardware on the computers. When there are errors in the registry it disrupts the computers ability to communicate. When the system cannot compute, it freezes up and displays the Windows blue screen.
I found a registry cleaner that is free and works rather well. It is named cCleaner, has been around for some time and did I mention FREE...Download it from thelink below run it should clean up your registry...where good men fear to tread.

http://www.ccleaner.com/ccleaner-20

good luck, please leave a rating...thank you

Please try to unplug the laptop from power and remove the battery for over 10 seconds. Then start it up again. There are other things we can try if this does not work.

This happens sometimes, but it's not very common.
Did you update any drivers recently?
Have you added any components to the computer just before this started?

You may have a faulty memory "stick". This is a link to Microsoft's Windows Memory Diagnostic. Follow the instructions to create a bootable CD, boot the CD and let it run and see if there are any errors.

The fix from Microsoft's website:
To resolve this problem, start your computer in Safe mode, remove the display adapter, rename the .inf files that are associated with the display adapter drivers, restart your computer in Normal mode, and then update your display adapter drivers. The following steps describe this procedure in more detail:

1. Start Windows in Safe mode. To do so:
   1. Restart the computer, and then press F8 while the computer starts.
   2. On the Windows Advanced Options Menu that appears, use the ARROW keys to select Safe Mode, and then press ENTER.
   3. Use the ARROW keys to select the operating system to start, and then press ENTER to start Windows XP in Safe mode.
2. In the message that states that Windows is running in Safe mode, click Yes.
3. Click Start, click Run, type msinfo32 in the Open box, and then click OK.
4. Under System Summary, expand Components, and then click Display.
5. In the right pane, note the information that corresponds to the INF File item, for example, Nv4.inf, Oem0.inf, or Atim128.inf.
6. Quit the System Information utility.
7. Click Start, right-click My Computer, and then click Properties.
8. Click the Hardware tab, and then click Device Manager.
9. Expand Display adapters, right-click the display adapter, and then click Uninstall.
10. Click OK.
11. Click Start, click Run, type cmd, and then click OK.
12. In the Command Prompt window, type the following commands, and then press ENTER after each line: ren %systemroot%\inf\INF file name from Step 5.inf *inf.old
    ren %systemroot%\inf\INF file name from Step 5.pnf *pnf.old
13. Close all open windows, and then restart the computer in the typical manner.
14. Log on to Windows by using an account that has administrative privileges, and then wait for Windows to detect new hardware.
15. When the Found New Hardware Wizard starts, click Cancel.
    
    If you receive a stop error after you remove the updated display drivers, restart the computer and use the Last Known Good Configuration option. To do this, restart the computer, and then press the F8 key while the computer starts. On the Windows Advanced Options Menu that appears, use the ARROW keys to select Last Known Good Configuration, and then press ENTER.
    
    If you receive a "System Has Recovered from a Serious Error" message when Windows starts, restart the computer again. This error message does not recur.
16. Obtain and install the latest drivers for your display adapter.For information about how to contact your computer manufacturer, visit the following Microsoft Web site: http://support.microsoft.com/gp/vendors (http://support.microsoft.com/gp/vendors)

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe


I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

Just use ORIGINAL OS CD and repair OS everything will work fine!

Try to increase your virtual memory.  This may help you some.