BUILTIN\administrators access issue

I'm the administrator, I have a report in home folder, I gave access to a user as (browser). Then by mistake I deleted my access from security option, now I can still see the report in home page but I can't delete it or giving my self access again.

If I press manage, error massage come ( The permission granted to user '<server name>\administrator' are insufficient for performing this operation.

How can I delete this report.