Service 'Apple Mobile Device Service' (Apple Mobile Device Service) failed to start. Verify that you have sufficient privileges to start system services????

I recently got an iPhone 5s and had to download the new itunes which I had been putting off for ages, otherwise it wouldn't sync. It wouldn't let me download and instead said 'service mobile device service' failed to start. I then tried to uninstall (as recommended by apple) and re install but the same error came up. If i click ignore, it finishes downloading but refuses to open, instead coming up with 'error 7 windows error 193'. Ive tried everything and this is really frustrating, help would be much appreciated 🙂