I have just joined this forum to ask this question:
A few weeks ago I installed the 30 day trial version of BitDefender Internet Security 2010 after my subscription with F-Secure ran out and their 2010 version did not work as well as their 2009 offering (wish I'd stuck with that...).
Since installing BitDefender my internet usage has roughly doubled. I am on a 20GB monthly limit and that has already been exceeded and we are barely half way through the month. I disconnected the wireless router and put the modem back on thinking maybe neighbours had found a way in (even though it is WAP/WEP secured) but a couple of days after that test it is still the same. We are not using the internet for anything other than its the usual. Last Saturday it was 3.5GB but I spent the whole day with a new game (not playing online)!
Has anyone seen this sort of thing before? I can't imagine how it could be down to BD but I am clutching at straws...