Plz help - trying to open file

Yes- I'm just not sure if you've done it... (which requires deleting existing Windows partitions (step 13) - part of the sequence).

You will lose everything in the partitions you delete.

Example: UEFI install: Windows partition, Recovery, EFI, System.

If you have other data partitions on the same drive, you don't need to delete those.

Best protection: Update your disk image beforehand. You can then mount the disk image file (it appears as a drive) and copy any file from it.

You should (almost) never need to intervene manually like that. An odd exception is when you install certain very old programs when perhaps one file is missing- sometimes .ocx rather than a.dll.

Did you see some error message immediately after installing Windows, or after installing a load of programs?

Suggest you test your disk if you've not.
Hard Disk Sentinel (trial) - best immediate diagnostic description I know.
Failing that, SMART parameters- HD Tune (Health and Error scan tabs).

Great -so when did the problem occur? I said

Did you see some error message immediately after installing Windows, or after installing a load of programs?

As your disk is good, and hopefully no other hardware problem, presumably your dll problem occurred later on.

A screenshot of what you are seeing might help someone.

Google can help if you simply search for msvcr120.dll

Msvcr120.dll is missing? Download it for Windows 7, 8, 10, Xp, Vista, 32 or 64 bit - Fix4Dll.com
MSVCR120.dll Missing - Microsoft Community