Hello to all, i have create an C# console application but display two warning which are

Invalid search path 'C:\Program Files\Microsoft Visual Studio\VC98\mfc\lib' specified in 'LIB environment variable' -- 'The system cannot find the path specified. ' Email
Invalid search path 'C:\Program Files\Microsoft Visual Studio\VC98\lib' specified in 'LIB environment variable' -- 'The system cannot find the path specified. ' Email
What is this all about ?

Thanks.