Hi to all. My friend Colin had his XP Home system repaired by a tech because it stopped acting normally after he installed some software off the web. The 80 critical updates could not be installed. Norton 2007 was disabled. I booted into safe mode (after I uninstalled the offending program AdAlert) and uninstalled Norton and Live Update. Colin didn't have the Norton 2007 CD with him at this location so I installed AVG free and SpyBot S&R I ran Spybot and it found and removed 7 nasties. AVG was updated successfully. All is ok except that Windows XP critical updates will not install. Even trying one at a a time - no go. What should we try next? TIA Basil.