dear moderator, hello my name is bob and i really need your help!!! i'm fairley new to computing and my computer is acting realy stupid!1 i cannot open certain programs and othewrs wqill not download or run. i have windows xp on a dell deminsions computer. iuse avg free anti svirus, i run crap cleaner also sapybot search and destry also windows defender. my computer says i don't have a virus but it's slow amd acxtimg stupid!1 HELP HELP HELP.. you can contact me at [email removed] thank you for your help