I have two questions. First:

Installed Boinc screen saver on Windows 7 64-bit machine (sadly I have to have a Windows machine for a client, but only until year end then I will once again be Windows free!) This morning there were about a dozen windows and message boxes all saying: "Missing MSVCR100.dll" I did a quick search here and don't find it. I did not install boinc with virtualbox because I already had Oracle VirtualBox installed for client project. What is causing this error and how do I fix it?

Second:

I took the defaults during installation, but that turns on the screen saver. How does one turn that off after installation? The screen saver does not let your monitors power down so it wastes electricity.

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Well, I did some searching and found the missing dll answer here:

http://www.faqforge.com/windows/fix-the-program-cant-start-because-msvcr100-dll-is-missing-from-your-computer-error-on-windows/

It appears Boinc for Windows isn't properly packaged as it neither includes nor forces installation of required dependencies.

Still would like to know a good way to turn off the screen saver after installation though. Does BOINC only turn on, not off?

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Well, I did some searching and found the missing dll answer here:

http://www.faqforge.com/windows/fix-the-program-cant-start-because-msvcr100-dll-is-missing-from-your-computer-error-on-windows/

It appears Boinc for Windows isn't properly packaged as it neither includes nor forces installation of required dependencies.

It might be BOINC which has a missing dependency (unlikely), or a science or graphics application from one of the projects you've attached to. That would require further investigation and information.

Still would like to know a good way to turn off the screen saver after installation though. Does BOINC only turn on, not off?

BOINC adds itself to the list of screensavers known to Windows (if you allow it to at installation time, that is).

From that point forwards, you control it using the Windows screen saver settings - you can choose which screensaver to use (or 'none'), how long to wait before it is displayed, and many other things besides.

The quickest way is probably to type 'screensaver' into the 'Search programs and files' box, at the foot of the Start button menu.

Having built several instances of BOINC from source code, I can tell you that MSVCR100.dll is not (or no longer) part of BOINC or its installer. MSCVP120.dll and MSVCR120.dll are parts of BOINC.

This C Run-Time Libraries article shows it is part of the multithreaded, dynamic link libraries, and thus more likely to be part of a project's science application or VirtualBox.

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This may be a red-herring, but browsing through the overnight list of windows security patches on a 32-bit Windows 7 machine, I found I was being offered

https://support.microsoft.com/en-us/kb/2999226

The Windows 10 Universal CRT [Universal C Runtime] is a Windows operating system component that enables CRT functionality on the Windows operating system. This update allows Windows desktop applications that depend on the Windows 10 Universal CRT release to run on earlier Windows operating systems.

Microsoft Visual Studio 2015 creates a dependency on the Universal CRT when applications are built by using the Windows 10 Software Development Kit (SDK). You can install this update on earlier Windows operating systems to enable these applications to run correctly.

MSVCR100.dll will certainly be a component of the Universal C runtime: this patch may, or may not, correct any problems where a different version of the file may be required because of the way a project has compiled its application programs.