hi, can you send(post) the file that you have return so,the problame might be cleare. =>one of the problame might be you have not saved the file with the extantion of *.c or *.cpp
due to sequrities and protection you might face problames with windows xp and windows NT.this problame will not occure with windows 98.or if you want to work with windows xp and windows NT then ask the qustion in on-line help by microsoft their engg. will show you the way....ok