But when i compile Hello world program it say no file like iostream found in directory as an error.
Sounds more like a problem with the library.
Did you look into other tabs to change where C::B search headers and libs?
The 2 absent files should not be mandatory to build a console only program (But I can be wrong, I'm not at all a guru of compilers and compilation). But you can search and specify them by hand to verify.
To be sure, post your complete build log