man Im confused

my pcs came with the FREE AVG..I also use Spysweeper & Ad-aware weekly....so far no problems

My kids shut off ANG for two weeks and bang it got infected big time with 44 viruses Trojan generic ones which created major pop-ups that dont stop....Ive tried to clean it out but forgettaboutit.....

looks like I'll have to get my tech to reformat their PC and start again...

Anyone using the PAID VERSIN of AVG wont it bet even better? although it has low ratings?