Not Again!

My adorable 7 year old was home yesterday because of another stomach ailment and asked to use the computer for Webkinz. We tried but the site was down, so I told her we would try after I took a shower. No computer, do not get on or come in here until then. Clear as day, huh? When I came back into the guest room she was running away from the computer. Everything on the desktop was huge and one of the 4 or so games she had tried to play was frozen. Then I saw McAfee was "unprotected." I reinstalled the protection and spent about 2 hrs unfreezing and reducing the rest of the issues. Today I was online and all of a sdden all these warning screens popped up about trojan viruses and a zillion others. So basically Miss Adorable has allowed some virus(es) of death onto our computer and I cannot get them off. Stress! Once again I cannot post besides on my phone and if some wacko posts happen, please know it is not from me and it is from the devil that's stealing my life away as I type on this tiny keyboard. Help.