GLUT Error

Hi everyone,
i’m have a problem, using the GLUT library.
developing under C++, all the programs compiled perfect and i could Execute the program.
then after i tried to run some openGL-based game i got an error - “cannot start openGL” and since then i cannot execute any openGL program in C++, getting the error msg:“GLUT fatal error in c:…*.exe :faild to create OpenGL rendering context”
i have a pentium 4 with nvidia Gforce4. tried to update to newest drivers and to reinstall al openGL dll’s and libs but nothing changes.
please, can anyone help??