My grandson put in a couple of programs in my PC he got for free from www.komando.com
out of the shareware section I have ,zone alarm firewall, AVAST & AVG as anti virus, and ad ware personal for spy ware. All are free to use and with ad ware we found 137 spy programs, with AVAST I found several worms, and Trojans. AVG, and AVAST checks your e-mail coming and going. I have not had a problem since he put them in. The zone alarm comes in a demo for the pro version you want to check the firewall box it has no limit on use it lets you know when someone is trying to get into your computer as well. Avast will go through your computer and find every bug in it and remove it. It will also stop bugs in incoming e-mail but still let you know who sent it.
HEY their free and they work.