I also experienced this on Friday although i didnt connect it with GR til reading this thread, thinking back this happened when i clicked on my hot matches email alert. Up came MalWareAlert saying my computer was in a critical state, so i clicked cancel, which took me to their site regardless. Then Internet Explorer popped up with a message saying it had blocked the site from downloading anything as it was suspicious. I have AVG and it has picked up nothing so far although it did pick up a trojan the day before, dont know if they are connected though