I had an infection with sdbot.m trojan. A number of things stopped working - antivirus (eTrust EZ) seemed to load on startup, but couldn't open the program to run a scan, also couldn't update signatures - any web page which contained a virus-connected word (e.g. scan, monitor, update) closed IE immediately - programs like stinger, housecall, wouldn't run - Windows Update wouldn't work either. After dealing with sdbot, (by running stinger from a command prompt) everything returned to normal, except Windows Update. This still comes up with the "Page Cannot Be Displayed" message. I have, I think, clicked all the Restore Defaults buttons, changed many settings then changed them back when it still wouldn't work, followed the instructions in Microsoft Knowledgebase article 243787, but problem won't go away. Adware/trojan removers don't find anything. I have even re-installed Windows (XP Home) as an upgrade. What have I missed?