how can i do this without harming.my pc and also how do i stop my computer from blocking.me from sites that i go to...well i go on some sites like fb,youtube and it will let me on,but then when im on it wont let me see pictures,then it will then it wont i check it for viruses and nothing.....i donwloaded something,then took it off.because it said i had a virus i have(AVG ANTI-VIRUS 2012).can anyone help thank you all