Error Message for Dynamic Link Library mscvp90.dll

21 August 2010

Introduction
When installing Ad-aware program, one will get the following error message for some PCs:

"procedure entry point?_xfunc@tr1@std@@YAXXZ cannot be located in the dynamic link library MSVCP90.dll "

Why?
This error is due to a wrong version of msvcp90.dll being installed by some programs for some reasons.
The dll is one of the C Run-Time Libraries for Visual C++ and programs such as Ad-aware use them.
According to some descriptions, there are 2 versions of such dll having the same name, msvcp90.dll, one for 64 bits and the other for 32 bits machine. XP operating system is a 32 bit machine.

What Next?If one is using a XP operating system and has encountered the problem.

Step 1: Download the correct version of Microsoft Visual C++ 2008 Redistributable Package (x86) from the following website for XP machines

http://www.microsoft.com/downloads/en/confirmation.aspx?familyId=9b2da534-3e03-4391-8a4d-074b9f2bc1bf&displayLang=en

Step 2 : Locate the directory C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRTxxxxx. In the directory, one should find 3 Nos of 90.dll files. Rename these files with an extension of .tmp. If one has 2 directories of similar name, do the same.

Step 3: Run the downloaded installation program called “credist_x86.exe”. The installation program will automatically uninstall and reinstall the correct version of 90.dll programs.

Step 4: Locate the directory C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRTxxxxx again. One will find the new 90.dll programs. Copy all the 3 programs to “c:\windows\system32”