WindowsServices running in Background

Question

I have created a Windows services which compares the Current Date with one stored in the registry and if they are the same or the date sotred in the registry is older than the current it launches an updater. The updater is an exe i created too and it works perfectly using the ThreadPool class, but the main problem is the files it download could be images as they could be videos so the download may take a time. I have some buttons and properties in the updater but if its launched from the Windows Services , the updater runs in the background. I know theres a property from the management service aplication, Allow interaction with desktop, but theres a property which allow u to do that from the main code, wen u install the service or so? Dont like the idea of phoning my customers and tell em what to do or just drive for hours just to go there and make 2 clicks. Ty for ur time.