I noticed a new zip folder called "Terms-and-ConditionsMemo.zip" containing 4 files in it. The folder was mysteriously placed as an icon on my windows desktop. Looking for general advice now, not specific virus removal instructions. FYI, OS is Windows XP SP2 & use KIS2010. Qu 1) Could I have unleashed malaware (hope Im using this term correctly, I want it to apply to virus, worms, trojans, etc) by just opening folder to see what files were in it? I did not unzip it. This was after I ran full KIS scan which did not detect any threats. As I did not recognize any of the files, I decided to quarantine the folder via KIS. 2) Does quarantine prevent malaware from doing anything? 3) Did I need to quarantine each file or the folder is enough? I no longer see the folder on my desktop and do see it in the quarantine list. 4) What additional steps should I take at this point? As to where it came from, the only things I have done different lately is a) connect via usb a new Iomega memory card reader/writer. Iomega denies they sent this folder. b) use the card reader to download photos from my camera's memory card. I have never used the card in another place and the camera was bought new and the sandisk was bought new and separately. this was the first time I read the card. c) downloaded pdf files sent to me from a work associate. I did not think to scan them first, as it was coming from a reputable company, but then again, I dont know what may have infected their system. From now on I will scan each pdf, etc. before downloading, but for now, what should I do? thanks for any advice. Im thinking it somehow came from the pdf I opened in email, (which I never did before this week!).