Hmm, you say it's your computer am I correct ?
One way of granting access to a file on your hdd, is to right click on that folder go to properties and navigate to security settings.
It should tell you what is currently enabled:
Read, write, and modify, the current user themselves can allow themselves to do this.
If you are not an administrator and only a local user their is not much we can do for you as we cannot verify if you own that computer or not.
Not calling you a lier or anything, but this site does take certain measures to prevent anyone from doing something they should not be doing with someone elses property.