How To Fix Urlmon.dll Errors

Purpose of Urlmon.dll
Urlmon.dll is an important file that is required by applications when they perform OLE (Object Linking and Embedding) operations.
Is it safe to remove urlmon.dll?
No, do not remove the urlmon.dll file. If you remove this file, applications, such as Internet Explorer that require OLE will not function properly.
Urlmon.dll causes Internet Explorer to shutdown on Windows XP computer
Issue
When using Internet Explorer on a Windows XP computer, the Internet Explorer closes and you get an error message that refers to the urlmon.dll file.
Recommended Solution
You may fix this problem by removing the security update KB942615. To do this, perform the following steps:

1. Click Start, click Control Panel, and then double-click Add or Remove Programs to open its corresponding window.
2. Select Security Update for Windows XP KB942615 and click Remove.
3. Restart your computer.

Note: If you find it difficult to ensure complete uninstallation using Add or Remove Programs, you may use a more efficient third-party tool, such as Perfect Uninstaller to perform the removal.
Urlmon.dll causes Internet Explorer 8 to shutdown on Windows Vista computer
Issue
While opening certain websites in Internet Explorer 8 on a Windows Vista computer, the Internet Explorer shuts down and an error message appears that points to urlmon.dll.
Recommended Solution
The above issue may resolve if you clear the restricted Websites list. To do this, perform the following steps:

1. Open Internet Explorer, navigate to the Tools menu and click Internet Options.
2. On the Security tab, click the Restricted Sites icon to highlight it, and then click the Sites button.
3. Select all Websites present in the list one by one and click the Remove button each time to remove the websites from the list.
4. After you have removed all the websites, click the Close button.
5. Next, click Apply and then click OK.

Urlmon.dll error in Windows XP when Windows starts
When you start your Windows XP computer, you receive the error listed below:
"STOP: c0000221 {Bad Image Checksum}
The image urlmon.dll is possibly corrupt. The header checksum does not match the computed checksum"
Recommended Solution
This error may occur if the copy of the urlmon.dll on your system is either corrupt or missing. To repair this urlmon.dll error, perform the following steps:

1. Insert the Windows XP installation CD in the CD-ROM and reboot your XP computer from the CD-ROM.
2. Press the R key to start Recovery Console, when Welcome to Setup screen appears.
3. Log in with administrative rights.
4. Next, type the following commands at the Command Prompt and press Enter after each command to run it -
   cd C:\windows\system32
   ren urlmon.dll urlmon.bak
   expand F:\i386\urlmon.dll C:\Windows\system32
5. Next, type exit and press Enter to exit command prompt.
6. Finally reboot your computer.