so i did a computer job for a friend and i normaly dont use sp3 for xp because i have always had problems when using it such as my wireless internet not working right, and certain programs like anti virus stop working. i noticed today that it wont let me instal avg, so i tried windows security essentials and avira, all sepratly of course, and they wont allow real time protection to be turned on, and when i install ad aware, it always wants me to restart to finish installation which never ends. i knew these problems were possible before i updated to sp3, but thought i should go ahead so i can try to learn whats going on, but have come up stumped. can anyone tell me what might be causing these problems?..when i use sp2, and update all the available updates, except for sp3, i have no problems at all. ijust so you know, i installed windows xp home sp2 from installation disc, as soon as that was done i installed sp3, then my drivers, rebooted, noticed problems with my wireless, id always have to disable then re-enable it for it to work after everytime i reboot, then installed the rest of available updates from microsoft, then i installed said anti virus and ad aware programs, and started having these problems...thanks for the input and knowledge, if any