Windows Service or Schedule Task

Hi,

I would like to have an automated process which does the following:-
[1] Connect to SQL Server
[2] Select FTP data (host, username and password) and "time to pull data" from a table
[3] Based on the "time to pull data" (say example 6:00am), it should connect to the FTP server using the selected FTP data
[4] Download all the files available in the FTP server to the local system.
[5] And this process should be executed continuously since, the step [2] will select more than one row with different FTP data and it's corresponding "time to pull data".

Having said the above requirements, my clarification is:-
[1] Should I use Windows Service or Schedule Task
[2] If "Windows Service" then how can the above requirement will be achieved, that is connecting to database, pulling data, connecting FTP as a said point of time, downloading available data to local system and the process round the clock?
[3] If "Schedule Task" then how can I develop modules task for "Schedule Task" using .Net and integrate that module in "Schedule Task".

Your timely guidance with sample code will be highly appreciated.

Mohandas K