You have to assume that you might not have permission to access some files and folders on your hard drive.

One solution is to manually run your application with administrator-level permissions, but it is easier to modify the manifest file so that the application automatically seeks admin level when it is run.

You can do this by adding a mainifest file to your project (Add new item...).

Then change the line

<requestedExecutionLevel level="asInvoker" uiAccess="false" />" 

to

<requestedExecutionLevel  level="requireAdministrator" uiAccess="false" />" 

Obviously, this might not solve your problem if the user who is meant to run the program does not have an administrator-level account.