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here are 6 things you can do when Windows XP won't boot.

Use a Windows startup disk

To create a Windows startup disk, insert a floppy disk into the drive of a similarly configured, working Windows XP system, launch My Computer, right-click the floppy disk icon, and select the Format command from the context menu. When you see the Format dialog box, leave all the default settings as they are and click the Start button. Once the format operation is complete, close the Format dialog box to return to My Computer, double-click the drive C icon to access the root directory, and copy the following three files to the floppy disk:

• Boot.ini
• NTLDR
• Ntdetect.com

After you create the Windows startup disk, insert it into the floppy drive on the afflicted system and press [Ctrl][Alt][Delete] to reboot the computer. When you boot from the Windows startup disk, the computer will bypass the active partition and boot files on the hard disk and attempt to start Windows XP normally.

Use System Restore

Another tool that might be helpful when Windows XP won't boot is System Restore.

To use System Restore, first restart the computer by pressing [Ctrl][Alt][Delete]. When you see the message Please select the operating system to start or hear the single beep, press [F8] to display the Windows Advanced Options menu. Now, select the Safe Mode item from the menu and press [Enter].

Once Windows XP boots into Safe mode, click the Start button, access the All Programs | Accessories | System Tools menu, and select System Restore.

Use Recovery Console

The Windows XP CD is bootable and will provide you with access to a tool called Recovery Console.

To boot from the Windows XP CD, insert it into the CD-ROM drive on the problem system and press [Ctrl][Alt][Delete] to reboot the
computer. Once the system begins booting from the CD, simply follow the prompts that will allow the loading of the basic files needed to run Setup.

Fix a corrupt Boot.ini

If you suspect that Windows XP won't boot because Boot.ini has been corrupted, you can use the special Recovery Console version of the
Bootcfg tool to fix it.

To use the Bootcfg tool, from the Recovery Console command prompt, type

Bootcfg /parameter

Where /parameter is one of these required parameters:

• /Add--Scans the disk for all Windows installations and allows you to add any new ones to the Boot.ini file.
• /Scan--Scans the disk for all Windows installations.
• /List--Lists each entry in the Boot.ini file.
• /Default--Sets the default operating system as the main boot entry.
• /Rebuild--Completely re-creates the Boot.ini file. The user must confirm each step.
• /Redirect--Allows the boot operation to be redirected to a specific port when using the Headless Administration feature. The Redirect parameter takes two parameters of its own, [Port Baudrate ] | [UseBiosSettings].
• /Disableredirect--Disables the redirection.

Fix a corrupt partition boot sector

If you suspect that Windows XP won't boot because the partition boot sector has been corrupted, you can use a special Recovery
Console tool called Fixboot to fix it. Start by booting the system with the Windows XP CD and accessing the Recovery Console as described in

To use the Fixboot tool, from the Recovery Console command prompt, type

Fixboot [drive]:

Fix a corrupt master boot record

If you suspect Windows XP won't boot because the master boot record has been corrupted, you can use the Recovery Console tool Fixmbr to fix
it. First, boot the system with the Windows XP CD and access the Recovery Console as described in

To use the Fixmbr tool, from the Recovery Console command prompt, type

Fixmbr [device_name]

Where [device_name] is the device pathname of the drive to which you want to write a new master boot record. For example, the device pathname format for a standard bootable drive C configuration would look like this:

\Device\HardDisk0

- Click on Start, Run and type the following command in the open box and click OK

services.msc

- Find the Automatic Updates service and double-click on it.
- Click on the Log On Tab and make sure the “Local System Account” is selected as the logon account and the box for “allow service to interact with desktop” is UNCHECKED.
- Under the Hardware Profile section in the Log On Tab, make sure the service is enabled.
- On the General Tab, the Startup Type should be Automatic, if not, drop the box down and select Automatic.
- Under “Service Status” on the General tab, the service should be Started, click the Start button enable it.

- Restart Windows

Add or Remove Programs has been restricted. Please check with your administrator.

This is due to one of the following Policy settings:

1. NoAddRemovePrograms
2. NoControlPanel

If your system is attached to a domain, your network administrator may have disabled the Add or Remove Programs applet. For standalone systems, follow the steps below to unlock the restrictions.

* Click Start, Run and type Regedit.exe
* Navigate to the following branches one by one:

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Uninstall
HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Uninstall

* Delete the NoAddRemovePrograms value if present in the above locations.
* Then, navigate to following locations:

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer
HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer

* Delete the NoControlPanel value in the above locations.
* Close Regedit.exe

What is nusrmgr.cpl ? nusmgr.cpl is Control Panel extension and you can control your computer user.

nusmgr.cpl is in C:\WINDOWS\system32\.nusrmgr




you can fix it with registry editor. Copy this line to notepad and save as fix_useracc.reg

Windows Registry Editor Version 5.00

;Fixes the "Red X" mark in User accounts applet
;More details at: http://windowsxp.mvps.org/redxaccounts.htm

[HKEY_CLASSES_ROOT\.ico]
@="icofile"
"PerceivedType"="image"
"Content Type"="image/x-icon"

[HKEY_CLASSES_ROOT\.ico\PersistentHandler]
@="{098f2470-bae0-11cd-b579-08002b30bfeb}"

[HKEY_CLASSES_ROOT\icofile]
@="Icon"
"ImageOptionFlags"=dword:00000000

[HKEY_CLASSES_ROOT\icofile\DefaultIcon]
@="%1"

save to desktop,right click and marge or double click.

* Click Start, Run. Type services.msc and press {ENTER}
* Double-click Windows Management Instrumentation
* Set the Startup type to Automatic
* Click Start to start the service.

Then run these commands from Start, Run dialog:

winmgmt /regserver
regsvr32 "%Windir%\system32\netshell.dll"
regsvr32 "%Windir%\System32\hnetcfg.dll"
regsvr32 "%Windir%\system32\wbem\wbemprox.dll"
regsvr32 "%Windir%\system32\wbem\wbemsvc.dll"
regsvr32 "%Windir%\system32\wbem\wbemcore.dll"
regsvr32 "%Windir%\system32\wbem\fastprox.dll"

When a Windows XP-based computer is running low on disk space, you receive a “Low Disk Space” message that, when clicked, starts the Disk Cleanup Wizard.

You are running very low on disk space on [drive]. To free space on this drive by deleting old or unnecessary files, click here.

To disable low disk space checks, follow these steps, log off, and then log on again: Follow these steps, and then quit Registry Editor:

* Click Start, click Run, type regedit, and then click OK.
* Locate and then click the following key in the registry:

HKCU \ SOFTWARE \ Microsoft \Windows\ CurrentVersion \ Policies \ Explorer

* On the Edit menu, point to New, and then click DWORD Value.
* Type NoLowDiskSpaceChecks, and then press ENTER.
* On the Edit menu, click Modify.
* Type 1, and then click OK.

Outdated or missing comdlg32.ocx runtime library is causing this error. Download the file to the Desktop and extract the comdlg32.ocx to your the Windows\System32 folder.

Note: If you already have a copy of comdlg32.ocx, backup the existing file to a different folder and delete it from System32 folder.

1. Download comdlg32.zip and save to Desktop.

2. Unzip the file using WinZip or any other utility.

3. Extract comdlg32.ocx to Windows\System32 folder.

4. Type the following command from Start, Run dialog:

regsvr32 %Systemroot%\System32\comdlg32.ocx

Note: If you're using Windows Vista, you'll need to run the above command from an elevated Command Prompt. To open an elevated Command Prompt, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.

You should see the following message:

DllRegisterServer in C:\WINDOWS\System32\comdlg32.ocx succeeded.