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WPF browser-hosted applications (XBAPs) may crash during start up

Article ID: 972928 - View products that this article applies to.

Source: Microsoft Support

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Symptom

WPF browser-hosted applications (XBAPs) may crash during start up.

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Cause

One cause of this problem is that system-level interface registrations are broken.

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Resolution

To have us resolve this problem for you, go to the "Fix it for me" section. If you prefer to fix this problem yourself, go to the "Let me fix it myself" section.

Fix it for me

To fix this problem automatically, click the Fix it button or link. Then click Run in the File Download dialog box, and follow the steps in the Fix it wizard.

Fix this problem
Microsoft Fix it 50811

Notes

This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD and then run it on the computer that has the problem.

Then, go to the "Did this fix the problem?" section.

Let me fix it myself

Re-register the broken interfaces by running the following commands:

regsvr32 %SystemRoot%\System32\actxprxy.dll
regsvr32 "%ProgramFiles%\Internet Explorer\ieproxy.dll"

On 64-bit Windows, also run the following commands:

regsvr32 %SystemRoot%\SysWOW64\actxprxy.dll
regsvr32 "%ProgramFiles(x86)%\Internet Explorer\ieproxy.dll"

On Windows XP and Windows Server 2003, these commands need to be run from a user account with administrative privileges on the machine.

On Vista or later, these commands need to be run elevated. Click Start, All Programs, Accessories. Right-click Command Prompt and choose Run as Administrator. At the command prompt, run the commands.

Did this fix the problem?

Check whether the problem is fixed. If the problem is fixed, you are finished with this section. If the problem is not fixed, you can contact support
(http://support.microsoft.com/contactus)
.
We would appreciate your feedback. To provide feedback or to report any issues with this solution, please leave a comment on the "Fix it for me
(http://blogs.technet.com/fixit4me/)
" blog or send us an email
(mailto:fixit4me@microsoft.com?Subject=KB)
message.

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More Information

One known cause of this problem is that system-level interface registrations are broken. In particular, registrations for the following interfaces may be missing:

· IID_IWebBrowser2

· IID_IShellBrowser

This can be due to failed installations or upgrades, or malware infections.

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