(20)how to refuse some website to appear in my computer?

你試下整整部機的網絡選項先啦！步驟如下：

開始 (start)→ 控制台 (control panel)→ 網絡和網際網路連線 (web and web connection -- I am not sure for this name, just somthing like that) → 按「隱私權」那頁→剔底部的『封銷快顯』

最好裝個anti-virus 同埋 anti-spyware軟件，到www.download.com直接search 呢兩個名就得。

建議你anti-virus用AVG anti-virus programme，anti-spyware我同學話Microsoft的Beta好喎！

Hope these helps~

double click your security centre in control panel.

Set security level to high. To avoid pop up.