Post subject: Pure does not like something you have!!!
You don't need UTPure on your own computer, this is an anti-cheat for servers only. If the server is kicking you, try making copies of your Default.ini, and DefUser.ini, these are clean copies of your UnrealTournament.ini and User.ini files. Rename the DefUser.ini to User.ini and the Default.ini to UnrealTournament.ini but keep the originals in your Unreal Tournament System folder, then copy these renamed ones in there as well and overwrite yours. You will need to setup UT again, but if you had any bad files, this should fix it. You may want to download the openGL video drivers on here as well and try them.