ok someone started to mess with me online, like hardcore trash talk, then i guess while i was talking to them they got into my system because when i was done and got off line all of my videos, music, tabs, and tutorials had been deleted. so i first went to get zone alarm. but im wondering. should i reload my whole computer since he has been in it. and also where can i get some free virus software and more firewalls. can i have more then one firewall on my computer? if he was in my computer once can he get into any time he wants to now? thanks..