Without becoming a member , there's no way for me to know what software may have been installed on your computer from Express Movie Downloads. Did you install any programs from the website? If it were me, I'd remove any software that was installed.

I'd suggest you update your AV program & scan your computer! Also scan for spyware & adware...if you don't have them already, Spybot & Ad-Aware are good & both are free.
Spybot S & D (free)
Ad-Aware SE Personal (free)

According to the Express Movie Downloads FAQ, you're entitled to a refund of you ask within 60 days of purchase