怎樣知道電腦中病毒 ？

有好多唔同既情況,
有時部機唔正常地好慢; 好多popup彈出; harddisk, network成日好忙...等等就最明顯。不過而家D毒好多系中左都唔知, 所以都係裝番個防毒同防spyware軟件check就最穩陣, 介紹幾個免費過你試下:

Antivirus:
AVG (Free): http://free.grisoft.com/
Avast! (1 yr free for home use): http://www.avast.com/eng/avast_4_home.html

Anti-spyware:
Microsoft Defender (free): http://www.microsoft.com/defender
Spybot (free): http://www.safer-networking.org/en/mirrors/index.html