Using DISM to repair WIndows when sfc /scannow can't repair Windows 10

I have found that sfc /scannow doesn't repair system files on Windows 10 in many cases.  Sfc /scannow will find problems but not repair them.

I have found a fix that won't work for the average user - only sysadmins with access to a Windows 10 ISO.

Here's what I did:

• Downloaded the Windows 10 Pro 64 bit version 1511 ISO from "Microsoft Volume Licensing Service Center" - this 4 GB file will take a while to download
• Mounted the ISO file as d:
• Ran this command from an elevated command prompt:
  DISM /Online /Cleanup-Image /RestoreHealth /source:WIM:d:\Sources\Install.wim:1 /LimitAccess
• Re-ran "sfc /scannow" after the DISM command above finishes

Installing Server OS on a Dell with a DRAC card and without a DVD Drive

Simple process for installing a server OS on a Dell server that came with a DRAC card (which I recommend in all cases).  

Download the ISO for the installation DVD (typically from the MS VLSC) such as the Windows 2012 R2 DVD ISO.

I recommend that you boot up the server and go through RAID configuration using Control - R to set up your RAID array before continuing.  RAID is not configurable inside Windows setup.

Open the DRAC web interface (default location is 192.168.0.120 with a username/password of root/calvin).  

Open a virtual console.

In the virtual console.

Click Virtual Media -> Connect Virtual Media

Click Virtual Media -> Map CD/DVD

Choose the ISO file from your local machine (the ISO file should be located on your phsyical machine - not at all on the server).  I highly recommend you do this over a wired connection.  It'll take 20+ minutes over a wired connection to transfer the contents of a 6 GB ISO file and more than an hour over wireless.

In Next Boot, choose virtual CD/DVD/ISO.

Installing .net 3.5 on Server 2012 - error '“Do you want to specify an alternate source path? One or more installation selections are missing source files…”

I was installing DirSync on a Server 2012 server (in the process of doing a staged migration to Office365 from an SBS 2008 machine) and DirSync required .net 3.5.  It should be easy, but when using Server Manager to install the feature, I got this error:

Do you want to specify an alternate source path? One or more installation selections are missing source files…

I followed these excellent instructions to install it:
http://www.danielclasson.com/install-net-framework-35-server-2012/

In my case, I downloaded the ISO file and unzipped just the sources folder and modified the path.