Hi D-Fred-Brown, Thanks for your really prompt reply. I tried following your steps until the end of step 3 by running the combofix. Initially, the google chrome can still be used, hence I am able to read your email. However, after this step 3, both the google chrome as well as the internet explorer cannot be used with the error message of DNS Server not responding. Hence, I added in a step myself by restoring the system till an earlier date. As such, I am still able to use the google chrome here to message you but the internet explorer still cannot be used. Anyway, after system restore, I use step 4 ( Security Check ) to see if you can pick out any errors from the log and hence help me with restoring the internet explorer, my original aim. Thanks. Below are all the attachments. Hope to hear from you really soon. Yours sincerely, Germaine TDSSKiller.2.8.18.0_07.08.2013_13.35.34_log.txt mbar-log-2013-08-07 (13-43-33).txt mbar-log-2013-08-07 (14-19-24).txt ComboFix.txt checkup.txt