The issue is a permissions issue. You have a few options. The one most would accept as proper would be to move where you are pulling the files to. Even admin accounts are treated as regular user accounts unless the program has been elevated. So I would suggest moving the files from Program Files to somewhere else. Maybe C:\ProgramData or C:\Git.
The other option is to explicitly give you account rights on the folder. Right click on the folder in question and click Properties. Then click Security and then Advanced. Add your user in and give yourself Full Control.