Windows Tasks Scheduler Job fail

Question

Hello,
I'm using Tasks Scheduler on Windows 2008 R2.
It executes .bat file which removes some files in particular directory.
When I am running this .bat file from command prompt it does the job and removes files but when I run it using Tasks Scheduler it 'completes successfully' but does not remove files. Note: I'm using the same account both for Scheduler and command prompt.
I tried to play with 'Run with highest privileges'', add path to 'Start in' ... nothing helped. The same batch works from prompt but does not from Scheduler.
Any suggestion?
Thanks