Quick little search to a similar problem:
Right click the problem Files Folder on C and choose properties.
Select the Security Tab
Click the Edit Button
Click the Add Button
Type the word 'Everyone' Into the box that is labeled 'Enter the object names to select'
Click the Check Names Button
Click OK
Now select the Everyone group and check the Full Control check box and click OK
Now select the Every group and click the Advanced Button
Click the Disable inheritance button
Click Convert inherited permissions into explicit permission on this object
Check the box that says Replace all child object permissions entries with inheritable permissions entries from this object.
Click apply
Click yes when prompted if you want to continue
Click OK
Click OK again
You may have to reboot or at least log off and log back on for your account to receive a new access token with the new permissions.
And for future reference, make sure you save your projects on another disk or partition from wherever your OS (and AGK) is installed. Ideally, you also want this folder to autosync to some cloud service like Google Disk, Dropbox or Box. Or even push into a github repo if so inclined to make your work available to others and get version control for free. Anyhow, this keeps your important source files backed up and safe for just about any mishap that could happen.
