I installed Norton Internet Security 2011 on my Lenovo Z60M ThinkPad laptop running XP Professional. During the installation it prompted me to unstall McAfee virus protection, which I accepted (and it completed) I ran a ful computer scan. I now have boot-up problems. The boot.ini file disappeared giving me boot-up error "boot.ini file missing, booting from Windows" -- I replaced boot.ini from my latest backup and this message disappeared, but now have a very slow boot-up that frequently does not complete and sometimes will even give me the blue screen of death. HELP!