WINDOWS2003 cannot load the user's profile, but the system's default profile lets you log in

First, fix the problem by fixing the registry

To resolve this issue, modify the registry to increase the Poolusagemaximum value and the PagedPoolSize value. To do this, follow these steps:
Click Start, turn to run, type regedit, and then click OK.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
On the Edit menu, point to New, and then click DWORD Value.
In the new Value #1 box, type Poolusagemaximum, and then press Enter.
Right-click Poolusagemaximum, and then click Modify.
In the Value data box, type 60, click Decimal, and then click OK.
If the PagedPoolSize registry key exists, go to step 8. If the PagedPoolSize registry key does not exist, create it. To do this, follow these steps:
On the Edit menu, point to New, and then click DWORD Value.
In the new Value #1 box, type PagedPoolSize, and then press Enter.
Right-click PagedPoolSize, and then click Modify.
Type ffffffff in the Value data box, and then click OK.
Quit Registry Editor, and then restart your computer.

Second, through Microsoft's official approach

To run a simple fix solution, click the Download button or the "fix this issue" link in the solution Knowledge Base article.
The File Download dialog box appears in your browser. Here are some examples of the different downloads dialog boxes on some of the most popular browsers:
For Internet Explorer 11, the download tooltip appears at the bottom of the Web browser.

For Google Chrome version 33, the download tooltip appears at the bottom of the Web browser.

The Save File dialog box will be displayed for the Mozilla Firefox 28.0,web browser.

Download the file, and then run it on your computer. For example, in the Internet Explorer 11 example mentioned above, click Run in the download prompt at the bottom of the browser.

Some packages may need to log on to Windows as an administrator. The system may prompt you for credentials when you run the package.

Follow the simple fix workaround to complete the prompts during troubleshooting. The exact hints may vary, depending on which type of package you download is easy to fix and individual solutions that are easy to fix.

Run a simple fix solution with a. diagcab extension (Windows 7 and later)

The first page of the Troubleshooting Wizard, you can click the Advanced link to choose whether to diagnose and fix the problem, automatically or manually select the potential fixes that you want to apply.

The solution takes time to diagnose and fix problems. You can see the progress in the wizard.

When the troubleshooting process is complete, the resulting page displays the problem that you cannot resolve. Clicking to view detailed information will display a detailed troubleshooting report.

Screenshot: It's easy to fix the solution with a single root cause.

Screenshot: It's easy to fix a solution with multiple root causes.

Run a simple patch solution with an. msi extension:

Accept the license agreement, and then click Next to continue.

Easy Fix MSI Solution Wizard End User License agreement
Microsoft's easy fix solution may prompt you that the solution does not apply to your operating system and application version.

Microsoft fixes this problem solution takes time to diagnose and fix your problem.

You can learn about this solution by clicking the "refer to Knowledge Base article back" button in the Full Diagnostics dialog box.