The anti-virus thing can be a real pain. These days they are over cautious and catch a lot of false positives when it comes to software. I've seen this with a few Bingo softwares - but really they were fine - just used some processes that some badware use as well.
As for Bingo Liner - use
this link and you'll get £8 of free games if you're a new player, rather than the standard £5.