Thanks again for all the great replies. He has a disc with Ubuntu, but he needs to run Visual Studio 2017 and create Windows applications, and he does not think he can do this easily under a Linux environment. But thank you and good to know.
DH e-mailed Dell customer service yesterday (Sunday...so no reply....not surprising) and he got an email back this morning. The tech said (and I quote)
"Many innocent machines have been destroyed with Microsoft updates." Apparently this is not their first time hearing this.
They are sending out a tech who will be here Wednesday of this week to replace the hard drive with Windows pre-installed. Free of charge. His PC is a custom build Dell under warranty, but he didn't think Dell would cover Microsoft updates gone wrong.....but apparently they will because it is happening so often.
Thanks again all. Appreciate the help very much.