Problem with include paths after resetting Windows 10

[chrisjo_2015]

I had to reset Windows 10 and reinstall VS 2017. Now C++ programs which previously compiled won't. The main error is E1696 cannot open source "stddef.h" for example. if I start a new project and include "stddef.h" it compiles with no problems.

I've looked at the paths and nothing seems strange. I'd appreciate someone pointing me in the right direction to solve this issue.


Many thanks.

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