MissBerry

Hi, I don't know much about computers but i'm having really strange/annoying issues and for the second time in three days pressing ctrl/alt/del doesn't bring the task bar up. I have to turn the pc off by pressing the on button. I was on youtube when everything froze and don't know what is happening with my pc? Google no longer remembers the text size i've set or shows the option "See full image size" when I google image something. I'm trying to use Firefox instead and wonder if my IE is broken? I had my very first virus last week and I can't figure anything out. I hope this is in the right section , sorry if it's not:o