Make that long story short, typically, there ware 3 ways to fix Netfxocm.dll error in your system. For more troubleshooting info, please simply move your mouse now.
Option 1 (NOT recommended)
Downloading so-called Netfxocm.dll like this one (MD5, 366b9e225c0e87a586b89796df832fdb) almost = ZERO help, because the exact factor/ reason could still unknown. Furthermore, you need to put the RIGHT file in the RIGHT or, ORIGINAL location. And, repairing such dll or exe error that make sense has always required some advanced computer knowledge and skills. For example, computer geeks would suggest you that you create a system/ registry backup file before making any changes to your current OS.
Option 2 (Could be helpful)
Try your best to reinstall the program when you FIRST encountered the said Netfxocm.dll error. In the meantime, always beware of sponsored installation packages, or bloated download / install, and more other unwanted items during the process. BTW, the abovementioned items have been known as PUPs, or PUAs, technically.
Option 3 (also as a proactive measure)
As you may know, some advanced sypware even malware has the ability or chance to hijack Windows’ core file or service (e.g., csrss.exe, lsass.exe, etc.) – this could be worse, so that you are annoying with this Netfxocm.dll error. Performing a virus check on Safe Mode with Networking would be the most useful option for you to repair Netfxocm.dll error. I would not repeat that, be sure that you gain the Admin right first and, update your security software.