請問我部電腦是否中了毒 ?

It's a ad pop up. It will ask you to dowload the software or run a scan for you, and ask you to buy this software. You could download ad-ware scanner or spybot to scan and remove. If that didn't work, let me know and I could give you more info.

可能你在下載期間中了毒，而NOD32 防毒軟件沒有按更新所以中了毒。

唔係。不過最直接嘅解決方法係剷機再裝過。