Open up the properties on the folder.
Select security tab | advanced | change permissions
Untick "include inheritable permissions" and select remove on the pop-up. Do NOT save (it will remove all permissions). Tick "replace all child object permissions..." so the contents of the folder will also be updated.
Select Add, enter your username and click Check Names, if you have entered your usename correctly it will be underlined (you might need to include a domain name). You can use Advanced to search.
Select the permissions you want (presumably "Full Control" which will tick all the other boxes), ensure apply to has "This folder, subfolders and files" is select (and that "apply these permissions to objects and/or containers within this container only" is NOT ticked).
Click OK to go back to the Advanced Security settings (which should have one entry now), click OK (which will change the permissions) and OK all the way out.
You are the only user with any access to the folder and files.
NB. Unlike *nix there is no "execute" permission in Windows, if you can read the file, you can (try and) execute it.
