What is msdia80.dll in my partition drive "H" and is it safe to delete it?

Hi Nsriyas,

The msdia80.dll file is a system file in Visual C++ and some other Windows based software applications.

Have you installed Visual C++ Redistributable Package on this computer?

You have a computer that is running a 64-bit operating system. You install the Microsoft Visual C++ 2005 Redistributable Package on this computer by using the Vcredist_x64.exe file or the Vcredist_ia64.exe file. When you do this, the Msdia80.dll file is installed in the root folder of the boot drive.

If you have installed Visual C++ in a different drive, then, it could have happened that the file is moved. In that case, I would suggest you to move the Msdia80.dll file to the Drive:\Program Files\Common Files\Microsoft Shared\VC folder. Then, use command prompt to register the Msdia80.dll file.

Follow the steps:

a)      Type cmd on the Start screen and right click on Command Prompt.

b)      Select “Run as administrator”. Type the following command and hit Enter:

regsvr32 driver:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll

If you have already uninstalled Visual C++ and the file is located in a different drive after uninstalling it, then, you can delete the file.

For reference, you can take a look at the article:

FIX: The Msdia80.dll file is installed in the root folder of the boot drive when you install the Visual C++2005 Redistributable Package by using the Vcredist_x64.exe file or the Vcredist_ia64.exe file

http://support.microsoft.com/kb/927665

Note: This link has information related to Visual C++ 2005 Redistributable Package which might not be compatible to Windows 8.

Please let us know if you need more assistance on this issue. We will be glad to help you.

Hi Nsriyas,

Thank you for the update on this issue.

Did you move the file to the file to the current location?

When the file is not moved to the correct location and when you try to register the file, you might receive such error messages. I would suggest you to recheck the location to which you have moved the file.

First of all, let's find out the current version of Visual C++ installed on the computer. To do so, follow the steps:

a) Press Windows and X key and click on Programs and Features.

b) Check if you are able to find Visual C++ application. If yes, check for the version as well.

Please let us know about the status of this issue.

​Hi Nsriyas,

I got the same "Module failed to load" error as the poster above. There is an error (more than one actually) in the article describing the process (http://support.microsoft.com/kb/927665).

It says to type this line at the command prompt:

regsvr32 driver:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll

where "driver" is replaced with the drive letter where the user's Program Files folder is located. ("driver" is a typo in the example of the command, it should be "drive" so it matches the instruction on where to move the file.) But Command Prompt treats the space after the word "Program" in the command as the end of the command (at least it does in Windows 8.1).

The path must be contained in quotation marks, like this:

regsvr32 "driver:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll"

Then it works.

I hope that helps others who are dealing with the frustration of a poorly-edited article.

Hi,

Thank you for sharing the information that helped resolve the issue. This will assist other community members to troubleshoot such issues.

Please feel free to ask more queries on Windows.

I got the same "Module failed to load" error as the poster above. There is an error (more than one actually) in the article describing the process (http://support.microsoft.com/kb/927665).

It says to type this line at the command prompt:

regsvr32 driver:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll

where "driver" is replaced with the drive letter where the user's Program Files folder is located. ("driver" is a typo in the example of the command, it should be "drive" so it matches the instruction on where to move the file.) But Command Prompt treats the space after the word "Program" in the command as the end of the command (at least it does in Windows 8.1).

The path must be contained in quotation marks, like this:

regsvr32 "driver:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll"

Then it works.

I hope that helps others who are dealing with the frustration of a poorly-edited article.

This same issue also happened to me. But thanks to this post I was able to gain helpful knowledge on how to fix the problem!

Anyway, I simply followed the instruction describe in this post.

Yes, you are definitely correct when you said that Command Prompt treats the space after the word "Program" in the command as the end of the command.

The path must be contained in quotation marks like you said. I tried it and it definitely worked 100 percent! A million thanks to you!

I got the same "Module failed to load" error as the poster above. There is an error (more than one actually) in the article describing the process (http://support.microsoft.com/kb/927665).

It says to type this line at the command prompt:

regsvr32 driver:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll

where "driver" is replaced with the drive letter where the user's Program Files folder is located. ("driver" is a typo in the example of the command, it should be "drive" so it matches the instruction on where to move the file.) But Command Prompt treats the space after the word "Program" in the command as the end of the command (at least it does in Windows 8.1).

The path must be contained in quotation marks, like this:

regsvr32 "driver:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll"

Then it works.

I hope that helps others who are dealing with the frustration of a poorly-edited article.

Thank you mycranium. So just to reiterate for those others who've had trouble - the following worked with driver/drive replaced with the actual drive letter of course, as per mycranium's instructions.
regsvr32 "C:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll"

Thank you very much for the information, the problem was solved, in my case "driver" is C:

regsvr32 "C:\Program Files\Common Files\Microsoft Shared\VC\msdia80.dll"

saludos from México

The OS is Windows 10