Create a .bat och .cmd file with a command line looking like: c:\program files\QlikView\Qv.exe /r c:\myQvws\myDoc.qvw and schedule that in Windows Task sheduler to be executed whenever you need to. If you need other Qv command line switches, check out chapter 6.1 in the reference manual
This functionality also exists within the QlikView Server where you can create tasks such as this as well as apply reduction, security and deployment preferences. You will also find that you can create sequences of these tasks. If you are using QlikView Personal Edition, QlikView Server and Publisher are not included. However you should be able to get information about these components from a local QlikView office.