Should also have mentioned that the on-line scan is free - as in no cost.
It will also pick up any other trojans, worms, spam-ware etc that has lodged on your PC.
By registering your email they will forward you regulr updates on new virus outbreaks and other good info.
Re Ockers description - he is spot on with reference to the emails you are getting though it doesn't explain the other goings on though they aren't necessarily virus related.