Yes, you are right. i found the problem finally. i have downloaded "key8s.dta" file from here before. This file (not zip,"key8s.dta" itself) in my download folder with 7.86 setup file. Because of that when i install, key8s.dta file automatically comes in GStuido7 folder. I deleted "key8s.dta" from download folder, i realized there is no problem so. i just wanted to help, sorry about the mess.