When i use the visual studio 2010,the system always didn't find the .exe file, then i go into the folder,and find that the system didn't made the .exe file when i debug the project.Please help me . Thanks

Today,i install the windows 7 system, before that i used windows xp system. when i installed the visual studio 2010,found that it didn't work, the system always didn't find the .exe file, then i go into the folder, and  i try again and agin, find that the system didn't made the .exe file when i debug the project.Please help me . Thanks