I don't know for sure if this is caused by Parallels, but it's the only significant thing I've done since W10 was last working. Everything worked finr using W10 via bootcamp; after I installed Parallels desktop, I get an error when Windows boots: MSVCP120.dll is missing (it's not, I checked). Actually I get the error twice in succession and have to dismiss both. This happens whether I start Windows via Parallels, or the old way, restarting in bootcamp. This error prevents me from using my most important program 3ds Max. And although there are other apps that still function, there is a spinning blue disk with the cursor that never goes away. I have tried doing a reset of Windows, but that fails either in Parallels, or when I restart the machine using bootcamp. If anyone knows how I can repair this, whether or not it's a problem that originates with Parallels, I'd appreciate it.