Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple Currently Developing Tool To Defeat Recent Malware Attack –
You most likely have heard of the recent Flashback malware attack which is said to have infected around 600,000 Macs. Well today Apple announced they are developing a piece of software to detect and remove the malware.
Apple did not give a release date for this tool but you can expect to see this included in a Mac update or to be available on its support Web site
Apple have already took one step in fighting this attack by releasing an updated Java 3 to fix the Java security flaw for systems running OS X v10.7 and Mac OS X v10.6.