msdia80.dll in Vista x64 OS

[charlice]

Hi Guys.

I already found one explaination from Microsoft. But I still don't think it explained my all problem.

http://support.microsoft.com/kb/927665/en-us

According to this artical, The msdia80.dll should be under:

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

In my machine, I have 2 partition.

In fact, in x64 OS, I can find 2 files.

1st one is under the D:\

The other one is in driver： \Program Files(x86)\Common Files\Microsoft Shared\VC\msdia80.dll

So, according to MS site. I should also put the D:\msdia80.dll into this folder.

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

My question is:

Is this 2 gonna conflict with eachother? Or I should keep them both?

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

driver： \Program Files(x86)\Common Files\Microsoft Shared\VC\msdia80.dll

Anyone could answer my problem? Please give me some hint!

Thanks!