how to daily build automatically?

I create a new buildtype, I want to do daily build with this new buildtype automatically, how can I do

I add a new windows taskproject, select the TFSbuild.exe as the programme that I want to run at 6:00 PM each day, in the run textbox,

I write as follows:

"D:\Program Files\Microsoft Visual Studio 8\Common7\IDE\TFSBuild.exe"

start <ubscmserver> <ubs 目> <automatedbuild>

but I found no outcome in my drop location at the scheduled time,why

Thanks a lot.