We don't know if the profile is bad here. The way it is phrased, I think it's more likely that this is just the normal difference between color managed and not.
There's no way to know until brianh provides a screenshot.
"Unfortunately, with Microsoft hardware: Windows updates, Graphics Card updates and Display manufacturers have a frustratingly growing reputation for installing useless (corrupted) monitor display profiles.
I CAN happen with Macs but with far less likelyhood, it seems."
To be clear, the bad monitor profile problem is entirely down to the monitor manufacturer: Dell, Samsung, Acer, Asus and LG mostly. It will happen on a Mac too, if the manufacturer profile is installed.