There's a missing colon after the drive letter and each single backslash needs to be replaced with a double backslash, or use a single forward slash instead.
That said, you really, really want to avoid absolute paths outside of stuff you get from the OS. There exist WinAPI functions to help you get the locations of user data.
Where do you wish to store the data for your program? User's AppData?
It won't let you put it there because no application has any business putting user data in Program Files directories.
However, if it is just static data your program needs to operation, then store it in the same folder (or a subfolder of) your application's executable. You can get the application's executable path using the WinAPI.
So again, which kind of data are you trying to read? Read-only resources needed by your program to run? Or user data that your program would like to update?