Is Alexa spyware?

[Ootsonati]

A few days ago I posted about a problem I was having with Mainconcept crashing. Since then I have had to reformat my HD and reinstall WinXP. When I first reinstalled Mainconcept I had no problem at all. Later I installed Spybot Search and Destroy, which asked me to remove a registry key called Alexa. After doing so, Mainconcept began to crash again. I restored the key, but now AdAware is also trying to get me to delete it.

My question is, is this actually spyware or a file that windows needs to work right? I've heard that SpyBot was written for Win98 and has not been updated for WinXP, and therefore is bad about confusing crucial system files with Spyware. On the otherhand, I've heard that Adaware doesn't have this same problem, so I'm wondering whether or not I need to delete Alexa or not.

[redwudz]

Here's a site that might offer a litte more explanation of 'alexa': http://www.imilly.com/alexa.htm