Are you missing this important file - MSVCR80.dll?

This seems to be a new problem:

Not having MSVCR80.dll may prevent installations of some software.

I just tried to reinstall Quake on a PC - it refused to install with a message basically saying 'Couldn't find library MSVCR80.dll (required by MpShHook.dll)'.

The problem lies with the installation of Windows Defender Beta 2.0 - do you have this installed?

Some people have found that uninstalling Windows Defender Beta 2.0 resolves the problem.

I have got around it by just putting MSVCR80.dll back in Windows\System32 and leaving Windows Defender Beta 2.0 alone.

A quick look on the internet shows that this problem is affecting installations of certain software.

On my system I found 3 copies of the file - one in Windows\WinSxS\ and 2 copies inside SiSoft Sandra - so I just copied the WinSxS one across.

EDIT:
IN FACT, DON'T JUST COPY THE FILE BACK AGAIN (LIKE I DID) - IT DOESN'T SEEM TO BE THAT STRAIGHTFORWARD, SO UNINSTALLING Windows Defender Beta 2.0 MAY BE THE CURRENT SOLUTION

You can get the file here if you cannot find a copy of it:
http://www.dll-files.com/dllindex/dll-files.shtml?msvcr80

I notice it is affecting Quake 4 and Call of Duty 2. It is not really that noticeble from a Google search as most people have things already installed on their computers - this problem will rear its head if you/they try reinstalling software.

There is a good explanation of the problem at the bottom of the following web-page - from a software company who have been affected by this:
http://www.cadzation.com/HelpDesk/quickfaq.asp

Mmm, Microsoft say:



I can't delete it, so am going to see if I can delete it in safe mode. Hopefully, this is the solution.

I do know that I tried to install Quake the other day and couldn't run it. But rather than investigate I just gave it to a charity shop and played Call Of Duty instead, lazy sod that I am.

Well, Microsoft's solution didn't work.

Cunningly, I moved the file that they said to delete - now I am going to copy it back and uninstall this Defender thing - with the file copied back I know I won't get some kind of uninstallation headache as well.

Yes!!! - it worked - uninstalling 'Windows Defender Beta 2.0' actually resolves it.

So, now we know the solution - uninstall 'Windows Defender Beta 2.0'.

I am assuming that I can then just reinstall 'Windows Defender Beta 2.0' and then uninstall it and reinstall it whenever I get a problem installing anything.

I'll keep you all posted.

Arm raised aloft, "puki" waves to the millions of 'guests' that visit this site every day.

You know who the 'daddy' is when you finally buy a Blitz product and join the community.

Maybe MS will solve this in later release.... I use SpyBot for some reason, Windows Defender sometimes cause strange problem on my notebook.

I guess then the morale of the story is remove your Windows defences.

Good find puki. Someone give him a gold sausage.

DO I get this right, this is an XP only problem?

F-Secure costs less than £15 from Scan ;)

you probably need to register the DLL with the system again:

regsvr32 <filename.dll>

Doing so will add it to the windows registry, and let dependend programs know where it can be found. Simply putting them in a system folder isn't enough most of the time.

No - I don't think it is that easy - Microsoft advise against that route. You have to find the right version of 'MSVCR80.dll' anyway to do that or you will get errors. Plus, you may run into future problems due to the new .dlls being Net 2.0.

'Windows Defender Beta 2.0' installs Net 2.0 dll's (even if you do not have Net 2.0) and, clearly, removes some from Windows\System32. Basically, it means the .dll (and possibly more than the one I found) are no longer in your Windows\System32 directory for other software to find. Microsoft think the solution is via patches to the software that cannot operate with the moved .dll's - that could equate to a lot of patches.