Failed To Create A Phone Book Entry

I have a huawei modem. When I try to connect to modem by using it then I got a message "Failed to create a phone book entry". Then I search to internet about this problem. I found a solution by the deleting file named "rasphone.pbk" where located is c:program dataMicrosoftNetwork ConnectionPBkasphone.pbk. It's say's delete the following file and try again. I perform that and success. But problem here, I perform that task by the "Administrator" user login. When I login by the other username such as my name, then I get the same message again. But when I login by the "Administrator" then I can connect to modem without any problem. Then I think, it seem for permission. Then I added my user name in the "Administrator" group. But problem still now. I try by the taking ownership of that file, but it showing "access is denied". So I cannot replace ownership.