The general consensus is that K Alexa is nothing to worry about if you're talking about the single registry key that Internet Explorer itself places in the registry. If Ad-Aware showed something like this... [ ] K Alexa - \software\microsoft\internet explorer\extensions\{c95feo... Then that is just a simple registry key that is loaded whenever you install, upgrade or repair Internet Explorer. You can leave it or remove it without issue. Take a look at this thread, starting at reply #5, for more information on this: https://www.wilderssecurity.com/showthread.php?t=5756;start=msg37974#msg37974
