Why am I receiving error in Office 2003

When opening Outlook 2003, receiving error, "an exetenion failed to initialize
GaylaCharltonInformation SystemsAsked:
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Haresh NikumbhSr. Tech leadCommented:
to fix that Quit Outlook ​and ensure hidden files and folder is enabled in the folder options.

To view folders and files that are hidden, from my computer, click tools and then folder options. Click the view tab at the top of the window. Scroll down to the option Hidden files and folders. Click the option that says show hidden files and folders. Then click OK.
Navigate to the below location:

%USERPROFILE%\Local Settings\Application Data\Microsoft\Outlook

You will find extend.dat file->rename the file from extend.dat to extend. old.

Restart Outlook and check the result.

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GaylaCharltonInformation SystemsAuthor Commented:
Haresh NikumbhSr. Tech leadCommented:
Great , please mark solution as a accepted
Tapan PattanaikSenior EngineerCommented:
To resolve this problem, follow these steps in the order that they are presented.

Part 1: Create a New Profile

Note Because there are several versions of Microsoft Windows, the following steps may be different on your computer. If they are, see your product documentation to complete these steps.
1. Click Start, and then click Control Panel.
2. If you are not in Classic view, click Switch to Classic View, and then double-click Mail.
3. Click Show Profiles.
4. Click Prompt for a profile to be used, and then click Add.
5. In the Profile Name box, type a descriptive name for the new profile, and then click OK.
6. Click Add a new e-mail account, and then click Next.
7. Click the appropriate server type for your new e-mail account, and then click Next.
8. Follow the instructions that appear on the screen, and then click Finish.

Note Make sure that you specify a new personal folder file (.pst file). Do not use the existing file.
9. Click OK.
Note Because you do not use the old .pst file while you are troubleshooting, you will not see any of your old .pst folders or files.

Part 2: Rename the Outlook Data Files

Outlook automatically replaces the Extend.dat data file, the Outcmd.dat data file, and the Frmcache.dat data file if these files are missing. To rename the data files and then test to see whether the problem is resolved, follow these steps:

Note Because there are several versions of Microsoft Windows, the following steps may be different on your computer. If they are, see your product documentation to complete these steps.

1. Quit all programs.
2. Click Start, and then click Search.
3. Click All files and folders.
4. In the All or part of the file name box, type extend.dat, outcmd.dat, frmcache.dat.
5. In the Look in box, click Local Hard Drives.
6. Click More advanced options.
7. Click to select the Search hidden files and folders check box.
8. Click Search to search for the files.

By default, these files are located in the following folders, where drive is the drive where Windows is installed.

File Name      Default Location
Outcmd.dat      drive:\Documents and Settings\user\Application Data\Microsoft\Outlook
Extend.dat      drive:\Documents and Settings\user\Local Settings\Application         Data\Microsoft\Outlook
Frmcache.dat      drive:\Documents and Settings\user\Local Settings\Application Data\Microsoft\FORMS

9.  For each file that appears in the Search Results dialog box, right-click the file, click Rename,   type a new name for the file (for example, type extend.old), and then press ENTER.
10. Close the Search Results dialog box.
11.Start Outlook.
12.When you are prompted, click the new profile.
13. Create a new task or a new appointment to see whether the problem is resolved.

for more details: http://support.microsoft.com/kb/823475
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