Administrator doesn't have permission to run his task !

Good afternoon,

Could anyone help me with this problem ?

SUMMARY
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I always thought that someone logged in as administrator in Vista has full
(ie. read &write) access to all files and directories in the computer.
Vista's "task scheduler" is telling me that I do not have certain rights to
make changes to my tasks and that I do not have permission to access certain
directories.

DETAILS
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Well, as administrator, I told Vista's "task scheduler" to run a .bat file
which tells the computer to go into a couple of directories and delete all
the IE cookies that it finds there. Here are the directories:

C:\Users\User\AppData\Roaming\Microsoft\Windows\Co okies\Low
C:\Users\UserName\AppData\Roaming\Microsoft\Window s\Cookies

First, "task scheduler" tells me that I need "batch rights" in order to run
my task. Second, it tells me that I do not have permission to access the
above directories. I am running Vista on a home computer. There are two
accounts: "UserName" (which we all use) and, of course, the adminstrator
account.

I didn't realize that scheduling tasks would be such a big production !

Thanks for any help you can provide.