www.about.com info on computers browse site for what you want. Could be your Firewall protection blocking access.
However if
either school or works computer you are trying to un-block About.com won't tell you how because the site has been blocked for a reason by School/Work they aren't installed for your pleasure.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix notebooks/laptop pcs.