The 15 minute delay is well, a part of the original project (the program is a project to school), which would autorun at windows startup (done this), and does temporary internet files & cookie deletion every 15 minute (infinite/continous sleep, which I am capable of doing). So I need the 15 minute sleep command.
Edit:
--> So the program goes to every computer in my school, since there is users who goes to sites which leaves tracking cookies and malicious temp files. Perhaps now you understand my view.