I have an HP Pavilion a815n Desktop PC with Windows XP. So whenever I try to turn it on this error message pops up:

Error: We apologize for the inconvenience but Windows did not start successfully. A recent hardware or software change might have caused this.

It gives me all of these options of how I want to start the computer (i.e. safe mode, start from the last good configuration, start windows normally) but none of these seems to work as I cant even get to the welcome screen. The computer just keeps automatically restarting. I'm not sure what caused it. Could it be due to a software program I recently downloaded? Cause I just downloaded an Anti-virus trial verson from AVG at grisoft.com. Or could this be cause by an improper computer shutdown by pressing the power button?

So I decided to go to the HP support site to try and find out how to fix the problem and I've tried the following but none of these methods have worked:

Step 1: Removing recently added hardware
Use the steps in this section to disconnect any recently added hardware and test for the error.
NOTE: If a new internal device (sound card, hard drive, or other) was added to the computer before the error message started to occur, you have to remove it before continuing.

Turn off the PC and unplug the power cord.
Disconnect the mouse, and any other peripherals attached (Printer, scanner, webcam, zip drive, phone cord, network cable and other devices). Leave only the keyboard and MONITOR cable attached.
Press and hold the power button on the front of the PC. Release after 10 seconds.
Plug the power cord back in.
Turn on the computer.
The computer displays the We apologize for the inconvenience... message. Allow the timer to count down from 30 to 0.
If the computer successfully starts to the Windows desktop and does not restart to the error message, connect ONE device and wait until Windows recognizes it.
To find if a device is causing the error, continue connecting the devices, one at a time, restarting the computer each time, until the device that is causing the error is found.
NOTE: Be sure to wait until Windows completely starts before reconnecting devices. Check with the device vendor technical support for known issues, resolutions, updated drivers and troubleshooting information for the device.

Step 2: Restoring with System Restore
Use the steps in this section to restore Windows XP to an earlier time:
Turn off the computer.
Remove all attached devices except for the mouse, keyboard and monitor.
Turn on the computer.
When the We apologize for the inconvenience... message appears, use the UP or DOWN arrow key until Safe Mode with Command Prompt is highlighted and press Enter.
NOTE: If the computer stops responding or restarts automatically, skip to Step 6 to restart from the last known good configuration.

When the logon screen appears, select Administrator and enter the password (if applicable).
When the command window appears, type: cd \windows\system32\restore and press Enter.
Type: rstrui and press Enter. The System Restore screen will appear.
On the Welcome to System Restore window, select Restore my computer to an earlier time, then click Next.
On the Select a Restore Point window, select a date that is highlighted in bold print from the calendar.
Select a restore point from the window labeled, On this list, click a restore point and click Next.

If a message about closing programs appears, click OK. A Confirm Restore Point Selection window appears.
Click Next.
The PC should shut down and turn on automatically after the restoration completes and a Restoration Complete window should appear. If the PC stops responding, restarts automatically, or the error message reappears, skip to Step 6 to restart from the last known good configuration..
Click OK.
Restart the computer.
If the We apologize for the inconvenience... message reappears, continue with Step 3 to disable startup items that might be contributing to the problem.
If the error message does not reappear, you are done.

Step 3: Disabling startup items to start Windows
CAUTION: The steps in this section are used to prevent all startup items from opening INCLUDING antivirus software and other software that may provide important functions. Use these steps only for troubleshooting purposes:

Restart the computer.
At the first screen, press the F8 key repeatedly until the Windows Advanced Options Menu or the We apologize for the inconvenience... message appears.
Press the UP or DOWN Arrow KEYS until Safe Mode is highlighted. Press Enter to select it.
Select Microsoft Windows XP Home Edition, or Microsoft Windows XP Professional Edition.
When the logon screen appears, select Administrator and enter the password (if applicable).
Select Yes when the Windows is running in safe mode message appears.
Click Start, and then click Run.
Type the following into the Open field: msconfig
Click OK.
When the System Configuration Utility window appears, remove the checkmark next to Load Startup Items.
Click OK.
Select Restart on the message that appears.
If Windows does not load successfully after using the System Configuration Utility, skip to step 6 to restart from the last known good configuration..

Step 6: Restarting from the last known good configuration
The Last Known Good Configuration feature provides a way to recover from configuration problems such as newly installed drivers that may be incorrect for the computer hardware configuration. It does not correct problems that are caused by missing or corrupted drivers or files.
If the computer is not at the Windows Advanced Options Menu, or the We apologize for the inconvenience... screen, use the steps in this section to restart Windows XP from a system restore point that was last known to work:
Restart the computer.
At the first screen, press the F8 key repeatedly until Windows Advanced Options Menu appears.
Use the UP or DOWN ARROW keys to select Last known good configuration.
Press Enter to start Windows XP.
If Windows still does not start normally, continue to Step 7 .
If the error does not return, you are done.

Now I tried to do Step 7 but I wasn't able to access the Advanced Options. Here's what step 7 said to do:

Step 7: Renaming the Catroot2 folder
Use the steps in this section to replace the Catroot2 folder:
Turn on the PC and press the F10 repeatedly at the first screen to start the recovery screens. If the recovery application doesn’t start, you can run the recovery from the Recovery CD or DVD discs. For more information, see Performing an HP System Recovery in Windows XP .
If you see a welcome screen, click OK.
Click Advanced Options and then press the Alt and D keys at the same time to go to a command prompt.
Type: diskpart, and then press Enter.
At the diskpart> prompt, type: list volume, and then press Enter.
A screen similar to the figure below should appear outlining the current drive letters in the system. Note the drive letter in the Ltr column next to the HP_PAVILION, or PRESARIO NTFS partition. You will need this drive letter to complete this process.
Figure 2: List Volume display

At the prompt, type: exit, and then press Enter.
Type in the drive letter you recorded in step 6 , followed by a colon, ‘:’ (without the quotes) and press Enter. (For example, C: PRESARIO or H: HP_PAVILION )
Type the following: cd \windows\system32
At the new prompt, type the following: rd /s catroot2
Type Y to confirm.
Restart the computer.
You may receive the We apologize for the inconvenience... message again. Let the timer complete the countdown from 30 to 0.
If the computer still does not start, continue to Step 8 and perform a recovery.
If the computer starts into Windows and the error does not return, you are done.

So seeing as I wasn't able to do Step 7 I dont know if it would solve the problem

So on the HP site it seems that my last option is to perform a HP Systems Recovery but I dont know what files this might remove/replace and what this will do to my computer. Is there any way that I can make a back up of all of my files? And what type of files will the systems recovery replace/remove?

So what else can I do to fix this problem??? And what caused the error to happen in the first place so that I can avoid this from happening again?
Quote from: torn.jeans on August 08, 2007, 11:30:52 AM

A hardware or software change might have caused this.