Moviepass is a questionable program to say the least. I've been looking into it and there's a lot of people who have this on their computers and have no idea why - there's 50 plus people on Yahoo Answers alone.
It seems to download itself then sit in the background for 3 days after which time increasingly frequent pop-ups start appearing demanding payment as the 3 day free trial has expired. From what I gather these pop-ups are threatening to damage peoples credit ratings if they don't pay.
The only way to contact customer support is to subscribe and the only way to cancel is to subscribe.
I'm not 100% certain but I it seems a very strong possibility that Moviepass is Movieland under a new name. Movieland operated until recently from the US, Moviepass is based in London (or at least the Whois entry indicates so).
If anyone has this program it seems highly unlikely that it's the result of someone on your computer having visited questionable sites - I've heard of cases where it's been installed on office computers when the office is closed and on home computers in the middle of the night.
Anyway, adware, spyware and virus scans have little effect. Doing a system restore works and the link that Quietman mentions has instructions for deleting the files.
I've put together a more detailed step by step guide for beginners to experts which is here... http://profend.com/answers/moviepass.html
Apparently the way the site operates is illegal and they cannot force people to pay up as there's no license agreement and therefore no contract. This is just what I've been told and as I'm not a legal expert I don't know how true this is.
Hope this is of use to someone.