Thanks Stephen for replying and please pardon my seemingly paranoid reaction to this. One of the reasons why I am shifting to Linux is the frequent security problems and various viri which seem to plague windows systems. At one time my pc and the office pc was infected with 10 viri which fortunately norton was able to catch. And now this.

BTW, the .qt directory in my pc is NOT in the /tmp. It is one of the hidden directory on the /home/user. In this case, does this relate to the alert or it is not affected ,being not in the /tmp directory?