Hello DJ,
there can be two reasons why the message appears:
1) The Microsoft VC Runtime is really missing. In that case install the runtime following the links on page SAP Development Tools for Eclipse
2) The Eclipse installation can not identify your operating system (e.g. in case you are using Windows 10). In that case follow the instructions in note https://service.sap.com/sap/support/notes/2041195.
I assume that in your case the problem described in point 2 is the reason for the error message.
Best Regards,
Florian